Shepley, C. J.
The cause, after argument, is submitted for decision upon the bill and answers and upon an agreed statement of the facts.
By virtue of an Act approved on July 30, 1846, the plaintiff claims the exclusive navigation, by boats propelled by steam power, of that part of the Penobscot river above the town of Oldtown, so far up as it may be rendered navigable for such boats, by virtue of the Act.
By the first section, William Moor and Daniel Moor, jr., their associates and assigns, are authorized to improve the navigation of the river above that town ; and for that purpose to perform certain acts in the bed of the river.
By the second section they are authorized to hold land upon the banks of the river, and to appropriate certain property of the riparian proprietors, and to flow their lands upon payment of damages.
The third section declares, that the grant is made upon condition, that they shall within seven years improve the navigation of the river “ from Oldtown to Piscataquis falls, and from Piscataquis falls to the foot of the Five Island rips, and shall build and run over said route a steamboat, and shall within seven years build a canal and lock round said falls, or a railroad to connect the route above with the route below said falls.”
The fourth section grants to them, their associates and assigns, upon performance of the condition “ the sole right of navigating said river by boats propelled by steam from said Oldtown as far up, as they shall render the same navigable*”" [354]*354“ for the term of twenty years, from and after the completion of the improvement as provided in the third section of the Act.” It also prohibits the obstruction of the navigation for certain other purposes ; and provides, that boats not propelled by steam power, shall be allowed to make use of any locks and other improvements upon payment of a reasonable toll.
The fifil section authorizes them to become a body corporate, by the name of the Penobscot River Navigation Company, with the powers incident to corporations described and defined in the seventy-sixth chapter of the Revised Statutes, “ provided, that they shall at any time during the continuance of the grant, elect by a vote of a majority in interest, and proceed to organize under, and according to the provisions of said chapter of the Revised Statutes.”
The bill alleges, that the conditions required by the Act have been performed, and that the plaintiff has become by assignment entitled to all the rights and privtheges granted by the Act. It is admitted, that he “ is assignee of said charter, property and privtheges under it as set forth in the bill.”
The objections which have been made to the maintenance of the suit, and to the decree prayed for, will be noticed in their order.
1. The jurisdiction of the court was examined upon a motion for an injunction pending the suit, and the objection made to it, was overruled by an oral opinion, notes of which were taken by an intelligent member of the bar, which appear to have been published in the Law Reporter, vol. 12, No. 6, (see also, 31 Maine 365,) in a manner, that might lead a reader to the conclusion, that a maturely considered opinion had been drawn in writing. It may not be useful to present the reasons in a more perfect manner.
2. The performance by the grantees and their assignees of the conditions required by the third section of the act; what was required by a correct construction of the Act, and how far the defendants were entitled to make the objection, were noticed in the same oral opinion. As the objection has not [355]*355been renewed, it may not be useful to enter upon any further discussion of these matters.
3. The right of the plaintiff to maintain the suit in his own name, and not in the name of the corporation is for the first time denied.
The law is different as administered in courts of equity and courts of law, respecting parties plaintiff. Courts of equity do not so much regard technical difficulties, as they do the fact, that the suit is prosecuted by those, who represent the entire legal and beneficial interest to the matter in litigation. Hence assignees of all the interest to rights and contracts may maintain suits respecting them in courts of equity. Whitney v. McKenney, 7 Johns. Ch. 144; Trewthick v. Austin, 4 Mason, 41.
Holders of shares in corporate bodies may, under certain circumstances, maintain suits against their officers and against other shareholders. Gray v. Chaplin, 2 Sim. & Stu. 267; Hichens v. Congreve, 4 Russ. 562.
But a suit cannot be maintained by all or any portion of such shareholders, involving the interest of the corporation, unless the corporation itself will be bound by the judgment. In this case the plaintiff appears to be the sole assignee and owner of the corporate franchise, if such there be, and it might be difficult to determine, that the corporation would not be bound by the judgment, or that it was absolutely essential, that the suit should be prosecuted in the corporate name. It is not, however, necessary to decide this question, for the rights and privtheges granted do not appear to have become vested in a body corporate. They were granted to the persons named in the Act, and to their associates and assigns, and not to a corporation. There is no proof, that they have been conveyed to one.
The plaintiff is admitted to be the sole owner, which is inconsistent with any other ownership.
The grantees by the Act are not constituted a body corporate, except upon certain conditions precedent. The privthege of becoming such a body at any future time during a contin[356]*356uance of the grant, is accorded to them. They can become such a body only, when a majority in interest elect to avail themselves of that privthege, and to organize according to the provisions of statute, chap. 76.
There is no proof, that a majority in interest have at any time elected to become a corporate body, or that they have organized as such according to the provisions of the statute. And no proof therefore of the potential existence of such a corporation, as that named in the Act. The objection cannot prevail.
4. The provisions of the Act are alleged to be repugnant to the provisions of the constitution of this State.
All the citizens of a country have by the common law a right in common to navigate its navigable waters. This is an inherent right, of which they cannot be deprived by the sovereign of any government, based upon an acknowledgment of the rights of its citizens. This is in substance the conclusion, to which the court came in the case of Williams v. Wilcox & al. 1 Willmore, Wallaston & Hodges, 477, in which the right of the British sovereign to destroy a common right of navigation in tide waters, was very elaborately investigated both by the bench and the bar. The defendants have a right in common to the navigation of the Penobscot river ; but the proof does not show, that by reason of being riparian proprietors or othenvise, they have any rights superior to those of other citizens. The right in common of all the citizens to the use of its navigable waters has been established by judicial decisions ; and that right is not limited in this State to waters, in which the tide ebbs and flows, but is admitted in lakes and fresh water' rivers, which are navigable. Berry v. Carle, 3 Greenl. 269; Wadsworth v. Smith, 2 Fairf. 278; French v. Camp, 18 Maine, 433; Brown v. Chadbourne, 31 Maine, 9. In the province of New Brunswick it was fully admitted in such waters by a decision based upon the common law, in the case of Esson v. McMaster, 1 Kerr. 501, The same doctrine has been admitted in most of the States of the Union, either by regarding fresh water rivers as [357]*357navigable waters, or by regarding them as common ways for passage and transportation. Scott v. Willson, 3 N. H. 321; Commonwealth v. Chapin, 5 Pick. 199; Palmer v. Mulligan, 3 Caines, 307; Pethin v. Olmstead, 1 Root, 217; Cason v. Blazer, 2 Binn. 475; Wilson v. Forbes, 2 Dev. 30; Cox v. The State, 3 Blatch. 193; Bullock v. Wilson, 2 Port. 436.
The common law accorded to the sovereign power, the “ care, supervision and protection” of this common right of navigatioxx in xxavigable waters, whether fresh or salt. Hale, de jure maris, chap. 4, prop. 3. This treatise has been received with approbation in most of the States as a correct exhibition of the law on those subjects, of which it treats. The power which has the “ care, supervision and protection” of a common right, is bound to regulate its use in such manner, that it may be safe and conveixient. The duty to make the use safe and convenient involves the right to remove obstructions, to improve, or to rexxder more safe and conveixient the waters for the purposes of navigation. The right to improve navigable waters is therefore accorded to, and it exists in the sovereign power, which is entitled to regulate the use of such waters for the purposes of navigation. The commoxx law conceded to the sovereign power, the care, supervision, protection, regulation and improvement of navigable waters, that no one might be molested iix the enjoyment of the use of them, or debarred of the exercise of his common right. Without regulation or without improvement, the enjoyment might be unsafe, inconvenient, or useless.
When several of the States of this Union, formerly subject to the British sovereignty, severed the ties, that' bound them to it, their respective citizens became possessed of the sovereign power in their States, and entitled to exercise the rights over navigable waters, which were formerly vested in the British crowxx. This they could not well do without a delegation of these rights to some form of government. Having formed a State government they yielded the exercise of these rights to it, and the State governments thus became rightfully [358]*358entitled to the care, supervision, protection, regulation, and improvement, of the navigable waters within the. States respectively in a manner not inconsistent with the provisions of their respective constitutions. These rights, or this power they still retain so far, as it has not been granted or delegated to the government of the United States. This State has therefore the right to make improvements in its navigable rivers and waters for the more safe, convenient and useful enjoyment of the common right of navigation in them.
When the people are in the enjoyment of that common right in several different modes, théir rights or privtheges are not, necessarily in any degree impaired or abridged by the introduction of another and new mode of using the waters for passage and transportation. The use of the waters in the accustomed modes may be rendered more safe and convenient by the improvements required for the introduction of the new mode. If the State may rightfully permit or restrain the introduction of a new and particular mode of navigation without prejudice to the common right of use in the accustomed manner, it may do so upon such terms and conditions, as it may judge to be expedient. And may therefore encourage its introduction, by a grant of the exclusive use of the waters in that mode for a term of years, as a compensation for the skill, expense, and risk required for its introduction. This it may do without an infringement upon, or a diminution of the common right of navigation existing at the time.
The agreed statement of facts does not show, that the navigation of the Penobscot river, in the accustomed manner, must necessarily be injured, or that it has in fact been injured,' or that the rights of the defendants or of any other citizen to such use, have been impaired or abridged by the introduction of a new mode of navigation by the Act, by boats moved by steam. It does not therefore appear, that any existing rights have • been invaded or diminished by the passage of the Act.
The right of the State, however, to impair and diminish the common right of passage and of transportation, in the [359]*359accustomed manner, for the purpose of increasing the facilities for its more safe, convenient and useful exercise in another manner, has been asserted and exercised in most of the States ; and in many of them, with the sanction of their highest judicial tribunals.
Permission has been given to erect dams, which impeded the navigation of rivers, to increase the facilities for their navigation, by means of canals and locks; and for the use of their waters to feed canals not useful for their own navigation. To place booms in and across navigable rivers to facilitate the floating of logs and lumber. To change the channel of rivers, by which the navigation of them, as formerly enjoyed has been entirely destroyed, to facilitate it in a new channel. t
Permission has also been given to erect dams, bridges, cause-ways, and other obstructions, impeding the navigation not for the purpose of giving greater facilities in another mode, but for the promotion of a common benefit in a manlier entirely disconnected with navigation. Such as dams, to create a water power for different manufacturing purposes, and to control and withdraw the water to supply aqueducts; and bridges and cause-ways to facilitate intercourse by land. Spring v. Russell, 7 Greenl. 273; Proprietors of Side Booms v. Haskell, idem, 474; Cottrill v. Myrick, 3 Fairf. 222; Parker v. The Cutler Mill-dam Co. 20 Maine, 353; Lebanon v. Olcott, 1 N. H. 339; Woods v. The Nashua Manfu. Co. 4 N. H. 527; Commonwealth v. Breed, 4 Pick. 460; Charles River Bridge v. Warren Bridge, 7 Pick. 445; Boston Mill Dam v. Newman, 12 Pick. 467; Mayor of Charlestown v. County Commissioners of Middlesex, 3 Metc. 202; Kellogg v. Union Com. 12 Conn. 7; Enfield Toll Bridge Co. v. The Hartford & New Haven R. R. Co. 17 Conn. 40; Lansing v. Smith, 8 Cow. 146; The People v. The Rensselaer if Saratoga R. R. Co. 15 Wend. 113; Zimmerman v. The Union Canal Co. 1 Watts & Sergt. 346; Susquehanna Canal Co. v. Wright, 9 Watts & Sergt. 9; Commonwealth v. Fisher, 1 Penns. 462; Monongahela [360]*360Navigation Co. v. Coons, 6 Watts & Sergt. 101; Gavit v. Chambers, 3 Ham. 495; Hogg v. Zanesville Canal & Man. Co. 5 Ham. 410; Willson v. The Blackbird Creek Marsh Co. 2 Peters, 245; The City of Georgetown v. The Alexandria Canal Co. 12 Peters, 91; United States v. The New Bedford Bridge, 1 Woodb. & Min. 401.
Many other cases might be cited, as well, if not better, suited to illustrate and establish the rightful exercise of such a power.
The provision contained in the constitution, that the Legislature “ shall have full power to make and establish all reasonable laws and regulations for the defence and benefit of the people of this State, not repugnant to this constitution nor to that of the United States” is especially relied upon.
The argument attempts to prove, that the Act is not a reasonable one; that it is not for the benefit of the people j and that it is the right and duty of this court to judge of it in both those respects.
The Legislature must of necessity judge of these matters in the first instance. This court is not authorized to decide whether an enactment of the Legislature, which by the constitution it is clearly entitled to make, is reasonable or for the benefit of the people.
The Legislature is expressly authorized to establish inferior courts. It does establish one. This court cannot decide, that it was not reasonable, or for the benefit of the people, that such a court or one of such a character should be established. To do so would be to violate the constitution and cause a conflict between these two departments of the government. When the Legislature decides, that an Act is reasonable and for the benefit of the people, as it does by making the enactment under the sanction of an oath to support the constitution, that decision must be conclusive, if the enactment be not repugnant to any provision of the constitution, and be not made colorably to effect one purpose under the appearance of effecting another.
If the Legislature should authorize private property to be [361]*361taken ostensibly for public use, when it is apparent by the enactment itself, that it was intended to be taken for private uses only, it would be the duty of this court, in a case properly presented, to examine and decide upon its character ; and it would not be bound by any declaration of the Legislature, that the property was taken for public use. But when the question is one of expediency merely the decision of the Legislature, that it is reasonable and for the benefit of the people, is conclusive. Spring v. Russell, 7 Greenl. 273; Parker v. The Cutler Mill Dam Co., 20 Maine, 353; Commonwealth v. Breed, 4 Pick. 460; The People v. The Saratoga and Rensselaer R. R. Co., 15 Wend. 132. The cases cited by the counsel for the defendants do not authorize a different conclusion. The remark referred to in the case of The City of Boston v. Shaw was made respecting a by-law, and not respecting a legislative enactment.
Whether it was expedient and in that sense reasonable, and for the benefit of the people to grant for so long a period, the exclusive navigation by boats moved b]r the power of steam, of that part of the Penobscot river, to induce persons of skill to incur the risk to be anticipated by their introduction and use, is a question, which this court is not authorized to entertain and decide. It does not find any provision of the Act to be repugnant to any of the provisions of the constitution of this State.
5. The provisions of the Act are alleged to be repugnant to that clause of the constitution of the United States which declares, Congress shall have power “ to regulate commerce with foreign nations, and among the several States, and with the Indian tribes.”
In the consideration of this question it will be admitted, that commerce includes navigation, and that the regulation of it includes the regulation of navigation, without regard to the kind of vessel employed, or the kind of waters, in which it is floated, or the kind of power by which it is moved. And without intimating any opinion upon the controverted ques[362]*362tion, whether Congress has the exclusive power to regulate commerce to the extent of the grant, its exclusive power to do so will be admitted, for the consideration of this case. That part of the power of Congress to regulate commerce, will only be considered which authorizes it to regulate navigation. The inquiry therefore will be limited to the extent of the power of Congress to regulate navigation. The thee different branches of the power to regulate commerce will be separately considered so far only, as that power extends to the regulation of navigation.
The first gives the power to . regulate navigation with foreign nations.
The exercise of this power is not limited by the bounds of any State. Vessels may be authorized to navigate waters within the bounds of a State, and to pass through a State, if it be practicable to do so while employed in this class of commerce. The power was conferred without regard to the jurisdiction of the States. The limits of a State do not constitute any portion of the elements, by which the extent of the power is to be ascertained and determined ; nor does the kind of waters, in which the vessel is navigated. The exercise of the power is not restricted to waters, in which the tide ebbs and flows. There may be commerce and navigation of this class upon fresh water lakes and rivers, and to the regulation of such navigation the power will extend.
This exercise of power is however restricted in these and in all other waters to the regulation of such navigation as can be employed in commerce with foreign nations. It is restricted by the natural limitation existing upon the practical and possible use of the waters for purposes of commerce with foreign nations. If a vessel cannot be navigated from waters within a State to a foreign port, the right to regulate the navigation upon such waters is not embraced by the terms, by which the power is granted. On the other hand when a vessel can be navigated from a port or place, within any of the States of the Union, to a foreign port or place, the United States may authorize it to navigate those waters, and no law [363]*363of a State can prevent it. From whatever ports or places within any of the States 'situate on tide waters, or on fresh water rivers or on fresh water lakes, a vessel can be navigated to a foreign port or place, there the laws of the United States may reach to secure and to protect her right to that navigation. Beyond this, such laws cannot reach for such a purpose. Upon waters not included within such limits, whether they be salt or fresh, vessels may be navigated without submission to the laws of the United States. To their regulation her laws do not and cannot extend. Their regulation is one of those rights not by this branch of the power conferred upon the United States, but is one of those reserved to the States, to be exercised by them with the same freedom and to the same extent, as it might have been, if they had never become members of the Union. The extent, to which the power of Congress to regulate navigation has been conferred, and to which it may be exclusively exercised, is ascertainable by ascertaining the simple fact, whether a vessel can be navigated from a port or place within the United States, to a port or place within a foreign country.
The second branch confers the power to regulate navigation “ among the several States.”
This power may also be exercised by Congress within the jurisdiction of the States, and upon fresh as well as upon tide waters with respect to vessels, which can carry on commerce among the States. Those vessels, and those only can be employed in such commerce, which can be navigated from some port or place within one State, to some port or place within another State. If they cannot be so navigated, they cannot be employed in commerce among the States. Congress may regulate the navigation of a vessel in all waters without regard to their distinguishing character, in which a vessel can be navigated from a place in one State to a place in another State; and this may include the navigation in waters between different ports or places in the same State, because such waters can be used for purposes of navigation among the States. Navigation upon the waters of [364]*364a State, which cannot be thus- used, is not comprehended by the terms, in which the power is confided to the United States. It is subject to regulation only by the laws of the State, in which it is employed. i
These rules are subject to a single exception; when a river, pond, or small lake, incapable of use for general purposes of navigation, constitutes the boundary in whole or in part, between the United States and a foreign country, or between different States of the Unión, the passage of ferry boats and row boats from bank to bank above falls or rapids, which wholly obstruct the passage of vessels by them down the current, will afford no evidence, that the navigation upon these waters can be subject to regulation by the power of Congress.
No judicial decision has been noticed, which denies to a State the right to regulate the navigation upon its interior waters, which cannot be navigated in the manner before stated for purposes of commerce with foreign nations or among the several States. On the contrary, that right has been admitted in those judicial opinions which have been considered to advance the most extensive claims to the regulation of commerce and navigation by the United States.
In the case of Gibbons v. Ogden, 9 Wheat. 194, Marshall, C. J., observes, “ Comprehensive as the word ‘ among’ is, it may very properly be restricted to that commerce, which concerns more States than one. The phrase is not one, which would probably have been selected to indicate the completely interior traffick of a State, because it is not an apt phrase for that purpose; and the enumeration of the particular classes of commerce, to which the power was to be extended, would not have been made, had the intention been to extend the power to every description. The enumeration presupposes something not enumerated ; and that something, if we regard the language or the subject of the sentence, must be the exclusively internal commerce of a State.” When speaking of the proper legislation of the States, the opinion states, “ Inspection laws, quarantine laws, health laws of every [365]*365description, as well as laws for regulating the internal commerce of a State” are parts of the mass. Again, “ If Congress license vessels to sail from one port to another in the same State, the act is supposed to be necessarily incident to the power expressly granted to Congress, and implies no claim of a direct power to regulate the purely internal commerce of a State.” With all deference it is submitted, that the power last named need not be claimed,- and that it does not accrue as an incidental or implied power, that it is expressly granted by being necessarily included within the limits, to which the right of the United States to regulate commerce extends by the terms of the grant; and excluded from the limits, to which the right of a State to regulate its internal commerce may extend.
Mr. Justice McLean observes, in his opinion in the Passenger Cases, 7 How. 283, “ Over the navigable waters of a State Congress can exercise no commercial power, except as regards an intercourse with other States of the Union or foreign countries.” “All commercial action within the limits of a State, and which does not extend to any other State or foreign country is exclusively under State regulation. Congress can have no more power to control this, than a State has to regulate commerce with foreign nations and among the several States.”
Mr. Justice Wayne, in his opinion in those cases, observes, “ Those regulations which affect only .the commerce carried on within one State, or which refer only to subjects of internal police, are within the po Avers reserved.
To Congress is granted the power to regulate commerce “ with the Indian tribes.”
No judicial opinion is lmown to have determined, that this branch of commerce included navigation. It was not the subject of examination in those cases, which decided, that commerce did include navigation.”
The admission, that commerce includes navigation, is not intended to include commerce with the Indian tribes.
The language must have been used with reference to such commerce with them as was known to have existed. The [366]*366treaties made with them before the Union, and the ordinances made by Congress under the confederation recognize and provided for trade or traffick with them. But no national, conventional or statute law, or ordinance is known to have recognized or authorized navigation to be carried on with any Indian tribe. No vessel, it is believed, had then or has since entered or cleared as arriving from, or proceeding to the territory of any such tribe. The grant was made to regulate a commerce, which had at the time a well known character. Hence Chief Justice Marshall, while presenting reasons for the conclusion, that the commerce, of which he was speaking included navigation, observes, “ All America understands, and has uniformly understood the word commerce to comprehend navigation. It was so understood, and must have been so understood, when the constitution was framed.” Let the same rule be applied to ascertain the meaning of commerce with the Indian tribes, and it will not be found to include navigation, but to include trade or traffick in goods and merchandize between those tribes and other persons.
Whatever may be the extent of the power, it cannot be construed to authorize Congress to regulate navigation upon the waters of a State, which cannot be used for purposes of commerce with foreign nations, or among the several States, without overruling the uniform declarations contained in the opinions of the Supreme Court of the United States, that the power to regulate commerce does not authorize the regulation of navigation on waters, which cannot be used for such purposes.
“ The Indian tribes” referred to, were those tribes- which were in a condition to determine for themselves with whom they would have commerce, or in a condition to have Congress determine it for them; and not those small tribes or remnants of tribes yet denominated tribes, which had before that time and have ever since continued to be under the control and guardianship of a State, and were without power to carry on commerce or trade, except by permission and under the regulation of the State laws.
[367]*367That the Penobscot tribe of Indians were, when the constitution of the United States was framed and adopted, under the complete control of State laws, and without the power to conduct commerce or trade, except by permission of a State, will appear by a reference to State enactments.
So early as the year 1633 the general court of Massachusetts ordered “ that no person whatsoever shall henceforth buy any land of any Indian, without license first had and obtained.” In 1650 the French, Dutch and other foreigners were forbidden to trade with them. In 1657 that Commonwealth declared its right to all the fur trade with them, and forbid others to trade with them in furs. It had before that time forbidden the sale to them of guns, gunpowder, and other munitions of war. In 1693 an Act was passed “for the better rule and government of the Indians in their several places and plantations.”
The first section provided for the appointment of persons “ to have the inspection and more particular care and government of the Indians in their respective plantations ;” and these persons were authorized to determine pleas betwixt party and party, and to punish criminal offences. Such a course of legislative control was, it is believed, continued until this State was separated from Massachusetts, although contracts denominated treaties were made with them by the State, for the relinquishment of their title to lands. By the Act of separation this State assumed the performance of all the obligations made by Massachusetts to the Indian tribes within her jurisdiction j and in the year 1821, passed an Act for the regulation of the Penobscot and Passamaquoddy tribes of Indians.
These laws will be ascertained by a reference to the ancient charters and statutes of Massachusetts, under the title, Indians. Neither the Congress under the confederation, nor the government of the United States, appear to have at any time exercised any control over, or to have made any contract or treaty with the Indians within the jurisdiction of Massachusetts or of this State. Tide American State Papers, title, Indian Affairs.
[368]*368By the agreed statement it appears, that the Penobscot tribe of Indians “ always have been, and pow are under the juris.diction and guardianship of this State.” This tribe cannot therefore, be one of those referred to in the constitution of the United States.
The conclusion must bp, that commerce with the Indian tribes did not include navigation, and if it did, that the Penobscot tribe was not one of the tribes referred to in the constitution.
It appears from the agreed statement of facts,” that the boat owned and navigated by the defendants, was enrolled and licensed for the coasting trade at the port of Bangor.
This can be of no importance, if she cannot carry on that trade. The power of Congress to regulate commerce, can neither be enlarged nor diminished by a grant of, or by a refusal to grant, a coasting license. Such a license, when received by a vessel: exclusively and necessarily employed in the waters of a State, which cannot be used to carry on commerce with foreign nations or among the several States is wholly inoperative. It would be unauthorized by the laws or constitution of the United States.
It further appears by the agreed statement, that the Act granting the exclusive navigation by steam power, does not apply to any part of the Penobscot river, which is within eight miles of any place, from which a vessel can be navigated to a foreign port or to a port in another State. It is limited to that part of the river, from which no vessel can proceed and pass out of the limits of the State.
The provisions of the Act are not therefore, repugnant to any provision of the constitution of. the United States.
A decree may be drawn by counsel and entered, to prohibit by injunction the defendants from navigating by boats propelled by the power of steam that part of the Penobscot river, in which a grant is made of the exclusive right of navigation in that mode, so long as such exclusive right shall continue ; and for the recovery of costs.