Wilkins, J.
The defendants, husband and wife, appeal from their convictions on indictments charging them with unlawfully and knowingly possessing “with intent to distribute in excess of two hundred grams of heroin, a Class A controlled substance under [G. L. c. 94C, § 31].” Their convictions for trafficking in heroin were based on violations of G. L. c. 94C, § 32E (c), as appearing in St. 1980, c. 436, § 4.
Each defendant received the sentence of fifteen years to State prison stated in par. 3 of § 32E (c). We granted a motion for direct appellate review and now affirm the convictions. However, because this court in
Commonwealth
v.
Marrone,
387 Mass. 702 (1982), held that par. 3 of § 32E (c), was invalid, the defendants must be resentenced pursuant to the general provisions of G. L. c. 94C, § 32E (c).
On September 25, 1980, Boston police officers and a special agent of the Drug Enforcement Administration of the United States Department of Justice conducted a search
of the defendants’ apartment on American Legion Highway in Dorchester pursuant to a search warrant. They announced their presence and made a forced entry of the apartment. They found Savannah Beverly putting a glossine bag containing a white powder into her mouth. They removed the bag forcibly. Officers at the rear of the apartment building saw Leon Beverly throw a paint can out of a window, shortly after other officers announced their presence. A bundle of glossine bags containing white powder was in the can. They found two similar glossine bags in Leon Beverly’s right rear pocket. They also found money in a shoe box and various items (utility bills, a birth certificate, and credit cards) tending to connect Savannah Beverly with the apartment.
There were a total of 191 glossine bags found, one taken from Savannah Beverly, two from Leon Beverly, and 188 from the paint can. The bags found on the defendants contained heroin. The 188 bags, with their contents, weighed approximately 483 grams, and the powder alone weighed approximately 292 grams. There was evidence that the powder was 3 % heroin and 97% an inert substance. There were, therefore, approximately nine grams of heroin within the mixture. There was also evidence that heroin is never sold in a 100 % pure form but rather is sold in a mixture having a relatively small proportion of heroin.
1. There was no fatal variance between the indictment and the proof. The indictment referred to the possession of “in excess of two hundred grams of heroin.” The proof indicated the presence of more than 200 grams of a mixture containing heroin but only nine grams of heroin. We may reasonably infer that the Legislature knew that heroin does not exist in a pure form, at least in the illicit drug trade.
People
v.
Solorzano,
84 Cal. App. 3d 413, 416 (1978). Because the word “heroin” does not refer to pure heroin, the statute does not require proof that the item possessed was pure heroin. See
Commonwealth
v.
White,
10 Met. 14, 15-16 (1845). The statutory reference to a mixture containing specific, controlled substances was included to make clear that the weight of the mixture, and not just the weight
of the controlled substance within that mixture, should be considered in determining the violation and the associated penalty. The defendants were not charged with possession of pure heroin and had no reasonable basis for believing that they were so charged. Of course, it would have been preferable if the indictments had referred to a mixture containing heroin. But, even if there had been a variance, the essential elements of the crime were correctly stated and the defendants have not shown that they were prejudiced in their defense. See
Commonwealth
v.
Grasso,
375 Mass. 138, 139-140 (1978);
State v. Tyndall,
55 N.C. App. 57, 62 (1981).
2. The judge correctly charged the jury that they could convict the defendants of the possession of more than 200 grams of heroin, if there was a mixture weighing more than 200 grams, containing some heroin. At least as applied to these defendants, we see no unconstitutional ambiguity in the word “mixture” in the statute. See
Opinions of the Justices,
378 Mass. 822, 826-827 (1979).
3. The defendants challenge the statute on due process and equal protection grounds arguing that possession of a mixture containing small amounts of a controlled substance may result in a greater penalty than possession of a mixture of lighter weight with a higher concentration (and thus a greater amount) of the same controlled substance. The volume of the material being sold provides a rational basis for dealing with trafficking in drugs. See
State
v.
Yu,
400 So. 2d 762, 764-765 (Fla. 1981), appeal dismissed sub nom.
Wall
v.
Florida,
454 U.S. 1134 (1982);
People
v.
Yettke,
95 Ill. App. 3d 365, 368-369 (1981), cert. denied, 455 U.S. 1000 (1982);
People
v.
Gorgon,
121 Mich. App. 203, 206-207 (1982);
State
v.
Tyndall, supra
at 60-61. Cf.
People
v.
Solorzano,
84 Cal. App. 3d 413, 416-417 (1978) (sanctions based on possession for sale of one-half ounce of heroin or “of a substance containing heroin” upheld).
4. Leon Beverly argues that he was denied the effective assistance of counsel. At the time of trial, his counsel had been suspended from the practice of law, but a stay of the judgment of suspension was in effect. During the trial, following revocation of Leon Beverly’s bail, his counsel stated that he had begun proceedings to attach the cash bail held in the Boston Municipal Court. We see no conflict of interest nor anything else in defense counsel’s conduct of the litigation that supports the claim of ineffectiveness of counsel and resulting significant prejudice to Leon Beverly. See
Commonwealth v. Rondeau,
378 Mass. 408, 412 (1979);
Commonwealth v. Saferian,
366 Mass. 89, 96 (1974).
5. There was sufficient evidence to warrant the jury’s finding beyond a reasonable doubt that Savannah Beverly possessed, with an intent to distribute, the heroin her husband threw out the window. Possession need not be exclusive. It may be joint and constructive, and it may be proved by circumstantial evidence. See
Commonwealth v. Dinnall,
366 Mass. 165, 168-170 (1974);
Commonwealth v. Nichols, 4
Mass. App. Ct. 606, 613-614 (1976);
Commonwealth v. Gill,
2 Mass. App. Ct. 653, 657-658 (1974).
6. Finally, Savannah Beverly challenges the judge’s charge on reasonable doubt as reducing the Commonwealth’s burden of proof substantially below the constitutionally mandated standard of proof. See
In re Winship,
397 U.S. 358, 364 (1970). The judge declined her request that he charge in the precise words of
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Wilkins, J.
The defendants, husband and wife, appeal from their convictions on indictments charging them with unlawfully and knowingly possessing “with intent to distribute in excess of two hundred grams of heroin, a Class A controlled substance under [G. L. c. 94C, § 31].” Their convictions for trafficking in heroin were based on violations of G. L. c. 94C, § 32E (c), as appearing in St. 1980, c. 436, § 4.
Each defendant received the sentence of fifteen years to State prison stated in par. 3 of § 32E (c). We granted a motion for direct appellate review and now affirm the convictions. However, because this court in
Commonwealth
v.
Marrone,
387 Mass. 702 (1982), held that par. 3 of § 32E (c), was invalid, the defendants must be resentenced pursuant to the general provisions of G. L. c. 94C, § 32E (c).
On September 25, 1980, Boston police officers and a special agent of the Drug Enforcement Administration of the United States Department of Justice conducted a search
of the defendants’ apartment on American Legion Highway in Dorchester pursuant to a search warrant. They announced their presence and made a forced entry of the apartment. They found Savannah Beverly putting a glossine bag containing a white powder into her mouth. They removed the bag forcibly. Officers at the rear of the apartment building saw Leon Beverly throw a paint can out of a window, shortly after other officers announced their presence. A bundle of glossine bags containing white powder was in the can. They found two similar glossine bags in Leon Beverly’s right rear pocket. They also found money in a shoe box and various items (utility bills, a birth certificate, and credit cards) tending to connect Savannah Beverly with the apartment.
There were a total of 191 glossine bags found, one taken from Savannah Beverly, two from Leon Beverly, and 188 from the paint can. The bags found on the defendants contained heroin. The 188 bags, with their contents, weighed approximately 483 grams, and the powder alone weighed approximately 292 grams. There was evidence that the powder was 3 % heroin and 97% an inert substance. There were, therefore, approximately nine grams of heroin within the mixture. There was also evidence that heroin is never sold in a 100 % pure form but rather is sold in a mixture having a relatively small proportion of heroin.
1. There was no fatal variance between the indictment and the proof. The indictment referred to the possession of “in excess of two hundred grams of heroin.” The proof indicated the presence of more than 200 grams of a mixture containing heroin but only nine grams of heroin. We may reasonably infer that the Legislature knew that heroin does not exist in a pure form, at least in the illicit drug trade.
People
v.
Solorzano,
84 Cal. App. 3d 413, 416 (1978). Because the word “heroin” does not refer to pure heroin, the statute does not require proof that the item possessed was pure heroin. See
Commonwealth
v.
White,
10 Met. 14, 15-16 (1845). The statutory reference to a mixture containing specific, controlled substances was included to make clear that the weight of the mixture, and not just the weight
of the controlled substance within that mixture, should be considered in determining the violation and the associated penalty. The defendants were not charged with possession of pure heroin and had no reasonable basis for believing that they were so charged. Of course, it would have been preferable if the indictments had referred to a mixture containing heroin. But, even if there had been a variance, the essential elements of the crime were correctly stated and the defendants have not shown that they were prejudiced in their defense. See
Commonwealth
v.
Grasso,
375 Mass. 138, 139-140 (1978);
State v. Tyndall,
55 N.C. App. 57, 62 (1981).
2. The judge correctly charged the jury that they could convict the defendants of the possession of more than 200 grams of heroin, if there was a mixture weighing more than 200 grams, containing some heroin. At least as applied to these defendants, we see no unconstitutional ambiguity in the word “mixture” in the statute. See
Opinions of the Justices,
378 Mass. 822, 826-827 (1979).
3. The defendants challenge the statute on due process and equal protection grounds arguing that possession of a mixture containing small amounts of a controlled substance may result in a greater penalty than possession of a mixture of lighter weight with a higher concentration (and thus a greater amount) of the same controlled substance. The volume of the material being sold provides a rational basis for dealing with trafficking in drugs. See
State
v.
Yu,
400 So. 2d 762, 764-765 (Fla. 1981), appeal dismissed sub nom.
Wall
v.
Florida,
454 U.S. 1134 (1982);
People
v.
Yettke,
95 Ill. App. 3d 365, 368-369 (1981), cert. denied, 455 U.S. 1000 (1982);
People
v.
Gorgon,
121 Mich. App. 203, 206-207 (1982);
State
v.
Tyndall, supra
at 60-61. Cf.
People
v.
Solorzano,
84 Cal. App. 3d 413, 416-417 (1978) (sanctions based on possession for sale of one-half ounce of heroin or “of a substance containing heroin” upheld).
4. Leon Beverly argues that he was denied the effective assistance of counsel. At the time of trial, his counsel had been suspended from the practice of law, but a stay of the judgment of suspension was in effect. During the trial, following revocation of Leon Beverly’s bail, his counsel stated that he had begun proceedings to attach the cash bail held in the Boston Municipal Court. We see no conflict of interest nor anything else in defense counsel’s conduct of the litigation that supports the claim of ineffectiveness of counsel and resulting significant prejudice to Leon Beverly. See
Commonwealth v. Rondeau,
378 Mass. 408, 412 (1979);
Commonwealth v. Saferian,
366 Mass. 89, 96 (1974).
5. There was sufficient evidence to warrant the jury’s finding beyond a reasonable doubt that Savannah Beverly possessed, with an intent to distribute, the heroin her husband threw out the window. Possession need not be exclusive. It may be joint and constructive, and it may be proved by circumstantial evidence. See
Commonwealth v. Dinnall,
366 Mass. 165, 168-170 (1974);
Commonwealth v. Nichols, 4
Mass. App. Ct. 606, 613-614 (1976);
Commonwealth v. Gill,
2 Mass. App. Ct. 653, 657-658 (1974).
6. Finally, Savannah Beverly challenges the judge’s charge on reasonable doubt as reducing the Commonwealth’s burden of proof substantially below the constitutionally mandated standard of proof. See
In re Winship,
397 U.S. 358, 364 (1970). The judge declined her request that he charge in the precise words of
Commonwealth v. Webster,
5 Cush. 295, 320 (1850). Although we have encouraged close adherence to the language of the
Webster
charge (see
Commonwealth v. Pires, ante
657, 664 [1983];
Commonwealth v. Tavares,
385 Mass. 140, 147 [1982];
Commonwealth v. Wood,
380 Mass. 545, 551 [1980];
Commonwealth v. Ferreira,
373 Mass. 116, 130 n.12 [1977]), we have upheld charges that have departed in certain respects from the
Webster
charge. See
Commonwealth v. Robinson,
382 Mass. 189, 197-198 (1981);
Commonwealth v. Smith,
381 Mass. 141, 146 (1980).
The adequacy of a charge on reasonable doubt must be determined from the entire charge. See
Commonwealth v.
Little,
384 Mass. 262, 265 (1981);
Commonwealth
v.
Smith, supra
at 145. Standing alone, a particular portion of a charge on reasonable doubt might be misleading, whereas in the context of the entire charge the language may be appropriate, or at least not so prejudicial as to require reversal of the conviction.
We have set forth in the margin a major part of the judge’s charge on reasonable doubt, indicating by numerals in brackets and by italics the four portions of the charge to which this defendant raises objection.
The language at
[1], standing alone, is deficient. To say that the jury may not ignore a “reasonable construction of the evidence” that leads to “a conclusion of guilt” fails to reflect the concept of proof beyond a reasonable doubt. We conclude, however, that this deficiency is overcome by other language in the charge. Similarly, we find no fatal defect in the language at [2] when it is considered in context. Standing alone, that language has much the same deficiency as the language at [1]. There is no substantial problem with this language, however, if it is considered with the language preceding it in the same sentence and with the strong and accurate language immediately following it.
The other two challenged portions of the charge on reasonable doubt, at [3] and [4], are accurate statements of the law. Language stating that proof beyond a reasonable doubt is not proof by a preponderance of the evidence, as in [3], is unexceptionable, although obviously the jury must be told much more. It is, likewise, accurate to say, as in [4], that if the evidence is balanced, the jury must acquit. Some courts have thought, however, that a jury might improperly infer from such language that, if the even balance tilted just slightly against the defendant, a guilty verdict would be
warranted. See
United States
v.
Hughes,
389 F.2d 535, 537 (2d Cir. 1968);
United States
v.
Guglielmini,
384 F.2d 602, 607 (2d Cir. 1967), cert. denied, 400 U.S. 820 (1970);
United States
v.
Link,
202 F.2d 592, 594 (3d Cir. 1953);
State
v.
Smith,
183 Conn. 17, 24-29 (1981). Cf.
Commonwealth
v.
Gerald,
356 Mass. 386, 390 (1969). Although a reference to the consequences of an even balance in the evidence preferably should not be included in a charge on reasonable doubt, in the context of the entire charge this reference could not have led the jury to an improper inference. Other courts have reached the same conclusion in analogous situations. See
United States
v.
Clay,
476 F.2d 1211, 1214-1215 (9th Cir. 1973);
United States
v.
Baratta,
397 F.2d 215, 227 (2d Cir.), cert. denied, 393 U.S. 939 (1968);
Rivera
v.
Smith,
544 F. Supp. 12, 14 (S.D.N.Y. 1982);
Hughes
v.
United States,
363 A.2d 284, 286-288 (D.C. App. 1976).
7. The defendants’ convictions are affirmed but their sentences are vacated. The defendants shall be resentenced under the general provisions of G. L. c. 94C, § 32E (c).
So ordered.