
242 U.S. 153 (1916)
HUTCHINSON ICE CREAM COMPANY ET AL.
v.
STATE OF IOWA.[1]
CROWL
v.
COMMONWEALTH OF PENNSYLVANIA.
Nos. 40, 50.
Supreme Court of United States.
Argued November 13, 1916.
Decided December 4, 1916.
ERROR TO THE SUPREME COURT OF THE STATE OF IOWA. ERROR TO THE SUPREME COURT OF THE STATE OF PENNSYLVANIA.
Mr. Walter Jeffreys Carlin and Mr. R.L. Parrish for plaintiffs in error.
Mr. George Cosson, Attorney General of the State of Iowa, for the State of Iowa.
Mr. William M. Hargest, Deputy Attorney General of the Commonwealth of Pennsylvania, with whom Mr. Francis Shunk Brown, Attorney General of the Commonwealth of Pennsylvania, was on the brief, for the Commonwealth of Pennsylvania.
*156 MR. JUSTICE BRANDEIS delivered the opinion of the court.
These cases were argued together. In each a state statute which prohibits the sale of ice cream containing less than a fixed percentage of butter-fat is assailed as invalid under the Fourteenth Amendment; the Supreme Court of each State having held its statute constitutional. State v. Hutchinson Ice Cream Co., 168 Iowa, 1; Commonwealth v. Crowl, 245 Pa. St. 554. Iowa makes 12 per cent. the required minimum; Pennsylvania 8 per cent. The material provisions of the several statutes are copied in the margin.[1]
*157 The right of the State under the police power to regulate the sale of products with a view to preventing frauds or protecting the public health is conceded by plaintiffs in error. And they do not contend that the particular percentages of butter-fat set by Iowa and Pennsylvania are so exacting as to be in themselves unreasonable. Thirteen other States have by similar legislation set 14 per cent. as the minimum; five other States 12 per cent.; only eight States have fixed a percentage as low as Pennsylvania; and *158 the United States Department of Agriculture has declared 14 per cent. to be standard.[1a] The main objection urged is this: To require that ice cream, in order to be legally salable, must contain some butter-fat is a regulation so unreasonable and arbitrary as to be a deprivation of property without due process of law and a denial of the equal protection of the laws. To support this contention the following trade facts are shown:
The ice cream of commerce is not iced or frozen cream. It is a frozen confection  a compound. The ingredients of this compound may vary widely in character, in the number used and in the proportions in which they are used. These variations are dependent upon the ingenuity, skill and judgment of the maker, the relative cost at a particular time or at a particular place of the possible ingredients, and the requirements of the market in respect to taste or selling price. Thus, some Philadelphia Ice Cream is made of only cream, sugar and a vanilla flavor. In making other Philadelphia Ice Cream the whites of eggs are added; and according to some formulas Vanilla Ice Cream may be made without any cream or milk whatsoever; for instance by proper manipulation of the yolks of eggs, the whites of eggs, sugar, syrup and the vanilla bean. All of these different compounds are commonly sold as ice cream; and none of them is necessarily unwholesome.
Plaintiffs in error contend that as ice cream is shown to be a generic term embracing a large number and variety of products and the term as used does not necessarily imply the use of dairy cream in its composition, it is arbitrary and unreasonable to limit the ice cream of commerce to that containing a fixed minimum of butter-fat. But the legislature may well have found in these facts persuasive *159 evidence that the public welfare required the prohibition enacted. The facts show that in the absence of legislative regulation the ordinary purchaser at retail does not and cannot know exactly what he is getting when he purchases ice cream. He presumably believes that cream or at least rich milk is among the important ingredients; and he may make his purchase with a knowledge that butter-fat is the principal food value in cream or milk. Laws designed to prevent persons from being misled in respect to the weight, measurement, quality or ingredients of an article of general consumption are a common exercise of the police power. The legislature defines the standard article or fixes some of its characteristics; and it may conclude that fraud or mistake can be effectively prevented only by prohibiting the sale of the article under the usual trade name, if it fails to meet the requirements of the standard set. Laws prohibiting the sale of milk or cream containing less than fixed percentages of butter-fat present a familiar instance of such legislation. Cases in the state courts upholding laws of this character are referred to in the margin.[1b] This court has repeatedly sustained the validity of similar prohibitions. Schmidinger v. Chicago, 226 U.S. 578; Armour & Co. v. North Dakota, 240 U.S. 510.
It is specially urged that the statutes are unconstitutional because they do not merely define the term ice cream; but arbitrarily prohibit the sale of a large variety of wholesome compounds theretofore included under the name ice cream. The acts appear to us merely to prohibit the sale of such compounds as ice cream. Such is the construction given to the act by the Supreme Court of Iowa. *160 State v. Hutchinson Ice Cream Co., 168 Iowa, 1, 15, which is of course binding on us. We cannot assume, in the absence of a definite and authoritative ruling, that the Supreme Court of Pennsylvania would construe the law of that State otherwise. The conviction here under review was for selling the "compound" as ice cream, so that we are not called upon to determine whether the State may in the exercise of its police power prohibit the sale even of a wholesome product, if the public welfare appear to require such action  and if, as here, interstate commerce is not involved. See Powell v. Pennsylvania, 127 U.S. 678, 685; Schollenberger v. Pennsylvania, 171 U.S. 1, 15.
In view of the conclusion stated above, it is unnecessary to consider whether the statutes are or are not sustainable as health measures; and upon this we express no opinion.
The judgment in each case is
Affirmed.
NOTES
[1]   Pursuant to stipulation, the case of Sanders Ice Cream Co. et al. v. State of Iowa, No. 39, October Term, 1916, in error to the Supreme Court of the State of Iowa, was argued on the record in the Hutchinson Case, supra, and disposed of in the same way.
[1]   Iowa: Code Supp., 1913, § 4999-a20:

"No person, firm or corporation, . . . shall manufacture or introduce into the state, or solicit or take orders for delivery, or sell, exchange, deliver or have in his possession with the intent to sell, exchange or expose or offer for sale or exchange, any article of food which is adulterated or misbranded, within the meaning of this act."
Code Supp., 1913, § 4999-a31e:
"For the purpose of this act, an article of food shall be deemed to be adulterated:
"First. If any substance or substances has or have been mixed and packed with it so as to reduce or lower or injuriously affect its quality, strength or purity.
"Second. If any substance or substances has or have been substituted wholly or in part for the article.
"Third. If any valuable constituent of the article has been wholly or in part abstracted.
"Fourth. If it does not conform to the standards established by law."
Chap. 175, Acts 34th G.A. (1911), p. 192:
"ICE-CREAM."
"1. Ice-cream is the frozen product made from pure wholesome sweet cream, and sugar, with or without flavoring, and if desired, the addition of not to exceed one per cent. (1%) by weight of a harmless thickener, and contains not less than twelve per cent. (12%) by weight of milk fat, and the acidity shall not exceed three tenths (3-10) of one per cent (1%)."
Pennsylvania: P.L., 1909, p. 63, Purden's Dig., vol. 5, p. 5209:
"An act for the protection of the public health and to prevent fraud and deception in the manufacture, sale, offering for sale, exposing for sale, and having in possession with intent to sell, of adulterated or deleterious ice cream; fixing a standard of butter fat for ice cream; providing penalties for the violation thereof, and providing for the enforcement thereof.
"SECTION 1. Be it enacted, &c., That no person, firm, or corporate body, by himself, herself, itself or themselves, or by his, her or their agents, servants, or employees, shall sell, offer for sale, expose for sale, or have in possession with intent to sell, ice cream adulterated within the meaning of this act.
"SECTION 2. Ice cream shall be deemed to be adulterated within the meaning of this act 
"First. If it shall contain boric acid, formaldehyde, saccharine, or any other added substance or compound that is deleterious to health.
"Second. If it shall contain salts of copper, iron oxide, ochres, or any coloring substance deleterious to health: Provided, That this paragraph shall not be construed to prohibit the use of harmless coloring matter in ice cream, when not used for fraudulent purposes.
"Third. If it shall contain any deleterious flavoring matter, or flavoring matter not true to name.
"Fourth. If it be an imitation of, or offered for sale under, the name of another article. . . .
"SECTION 4. No ice cream shall be sold within the State containing less than eight (8) per centum butter fat, except where fruit or nuts are used for the purpose of flavoring, when it shall not contain less than six (6) per centum butter fat."
[1a]   The requirements of the several States are set forth in U.S. Department of Agriculture (Bureau of Animal Industry) Circular 218, on Legal Standards for Dairy Products.
[1b]   Iowa v. Schlenker, 112 Iowa, 642; State v. Campbell, 64 N.H. 402; People v. Bowen, 182 N.Y. 1; State v. Crescent Creamery Co., 83 Minn. 284; Louisiana v. Stone, 46 La. Ann. 147; Deems v. Baltimore, 80 Md. 164; Commonwealth v. Wheeler, 205 Mass. 384; St. Louis v. Grafeman Dairy Co., 190 Mo. 507; State v. Smyth, 14 R.I. 100.
