delivered the opinion of the court.
Plaintiff in error (plaintiff in the original action) is a corporation which manufactures in the State of Illinois a proprietary table syrup composed of 85 per cent, com syrup or glucose, 10 per cent, molasses, and 5 per cent, sorghum, and sells it under the name.of “Mary Jane” in cans labeled as follows:
“5 Pounds Net Weight.
Mary Jane.
Reg. U. S. Pat. Off.
*429 Mary Jane is guaranteed by Com Products Refining Co. to comply with the Food and Drugs Act, June 30, 1906. Registered under serial number 2317.
Mary Jane. A Table Syrup Prepared from'Com Syrup, Molasses and Pure Country Sorghum. Contains Sulphur Dioxide.
M’f’d by Com Products Refining Co.
General Offices — New York, U. S. A.’.’
Prior to the beginning of the action plaintiff had agents and representatives employed in soliciting orders for this syrup from wholesale merchants in the State of Kansas, the orders being filled by shipping the required quantity of the syrup in interstate commerce in the original sealed cans with original labels attached. Defendants, who are the members of the State Board of Health of Kansas, deeming “Mary Jane” to be misbranded in several particulars within the meaning of the Food and Drugs Law of that State (c. 266, Kans. Sess. Laws, 1907, as amended by c. 184, Laws 1909; embodied in c. 35, Kans. Gen. Stats. 1909; c. 32, Kans. Gen. Stats. 1915), and regulations adopted by the Board under authority of that law, notified plaintiff’s agents and representatives and othér persons selling and dealing in “Mary Jane” syrup that unless plaintiff complied with Regulation 6 of the State Board by attaching in a conspicuous place on the outside of each can sold or offered for sale within the State a label with the word “compound” printed upon it, and stating definitely the percentage of each ingredient of which the syrup was composed, they would bé arrested and prosecuted. Similar warnings were communicated to wholesale and retail dealers who were and long had been selling this syrup in Kansas under the original brand and label.
Plaintiff brought an equitable action against the members of the board of health in one of the district courts of the State; setting up the pertinent facts, alleging that defendants were acting under the authority of the state *430 law • and certain regulations adopted by them pursuant to it, and among others Regulation 6, requiring that in the case of syrups the principal label should'state definitely the percentage of each ingredient, ha the case of compounds, mixtures, imitations, or blends; plaintiff further averring that , the state law and' the regulations referred to, particularly Regulation 6, were void because in conflict with the interstate commerce clause (Art. I, § 8) of the Constitution of' the United States and the Act of Congress of June 30, 1906, c. 3915, 34 Stat. 768, and also in conflict with the provisions of § 1 of the Fourteenth Amendment; and that defendaiats were interfering with plaintiff’s interstate commerce and with its lawful business in the State of Kansas, thereby threatening plaintiff w(ith great and irreparable damage; aaad praying for an injunction.
Their general demurrer having been overruled, defendants answered and the case came on for hearing, with the result that the district court made a finding “that all of the allegations of plaintiff’s petition are true”; and adjudged that there should be a perpetual injunction restraining defendants from interfering with the sale of “Mary Jaiae” in the State of Kansas upon the ground that it was misbranded when sold under the label above referred to, and in particular from interfering, because, of Regulation 6, with persons dealing in or selling the syrup, so branded, within the State.
Upon appeal, the Supreme Court of Kansas reversed the judgment with direction that the district court enter judgment for the defeaadants (99 Kansas, 63); and the case comes here on writ of error under § 237, Judicial Code, as amended September 6, 1916, c. 448, 39 Stat. 726, upon the contention that the Kansas statute and the regulations adopted by the state board pursuant to it, as interpreted and applied by the state court of last resort, are repugnant to the iiaterstate commerce clause of the Constitution of the United States (Art. I, § 8) and to the due process *431 and equal protection provisions of the Fourteenth Amendment, and especially are in conflict with the Federal Food and Drugs Act.
Upon the argument here, the attack was centered upon the effect of Regulation 6, which, so far as pertinent, reads as follows: “Manufacturers of proprietary foods are required to state upon the label the names and percentages of the materials used, so far as is necessary to secure freedom from adulteration and misbranding: (1) In the case of syrups, the principal label shall state definitely, in conspicuous letters, the percentage of each ingredient, in the case of compounds, mixtures, imitations, or blends. When the name of the syrup includes the name of one or more of the ingredients, the preponderating ingredient shall be named first.”
It wall be convenient to deal first with the contention made under the Fourteenth Amendment. It is not seriously insisted that there is a denial of the equal protection of the laws, and we see no ground for such a. contention. There is no discrimination against plaintiff in error or its product, or against syrups as a class.
It is, however, urged that since plaintiff’s syrup is a proprietary food, made under a secret formula and sold under its own distinctive name, and since it contains no deleterious or injurious ingredients, the effect of the reg-lation in requiring plaintiff to disclose upon the label the. ingredients and their proportions amounts to a taking of its property without due process of law'. Evidently the purpose of the requirement is to secure freedom from adulteration and misbranding; the mischief of misbrand-ing being that purchasers may be misled with respect to the wholesomeness or food value of the compound. And it is too plain for argument that a manufacturer or vendor has no constitutional right to sell goods without giving to the purchaser fair information of what it is that is being sold. The right of a manufacturer to maintain
*432
secrecy as to his compounds and processes must be held subject to the right of the State, in the exercise of its police power and in promotion of - fair dealing, to require that the nature of the product be fairly set forth.
Heath & Milligan Co. v. Worst,
We turn to the questions raised under the commerce clause and the act of Congress.
Although the Supreme Court in its opinion said nothing about interstate commerce, it cannot be doubted, in the state of the record,- that' defendants’ activities against wliich relief was sought included incidental interference with plaintiff’s interstate commerce in the “Mary Jane” syriip; and that the general judgment in favor of defendants amounts to an adjudication that the state law and regulations are to be enforced with respect to plaintiff’s product indiscriminately, not only when sold and offered for sale in domestic commerce but also while in the hands of the importing dealers for sale in the original packages and hence, in contemplation of law, still in the course of commerce from State to State. The silence of the Supreme Court upon the subject cannot change the result in this regard. In cases of this kind, Ave are concerned not with the characterization or construction of the state law by the state court, nor even with the question whether it has in terms been construed, but solely with the effect and operation of the laAv as put in force by the State.
St. Louis Southwestern Ry. Co.
v.
Arkansas,
*433 The question of repugnancy to the commerce clause may be treated (a) aside from federal legislation; and (b) in view of the “Food and Drugs Act" of Congress, June 30, 1906, c. 3915, 34 Stat. 768.
Upon this question, in both aspects, the judgment under review is clearly sustained by the decision of this court in
Savage
v.
Jones,
An attempt is made to distinguish
Savage
v.
Jones,
upon the ground that, the Indiana statute there under consideration covered a field of regulation which had not been included in the federal statute, whereas, it is said, the Kansas Food and Drugs Law is almost literally a reproduction of the federal law upon the same subject. It is true that the Kansas statute,
mutatis mutandis,
follows quite closely the lines of the act of Congress, and that its 8th section, which defines the term “misbranded” is almost a copy of the corresponding section of the federal act; but in the following proviso at the close of the section the words italicized have been inserted by the state legislature, they not appearing in the federal act: “And pro
*437
vided further, that nothing in this act shall be construed as requiring or compelling proprietors or manufacturers of proprietary foods, which contain no unwholesome ingredients, to disclose their trade formulas, except in so far as the provisions of this act,
or the rules and regulations of the State Board of Health,
may require to secure freedom from adulteration or misbranding.” These italicized' words make a very substantial difference. Section 3 of the Kansas act provides that “The State Board of Health is authorized and directed to make and publish uniform rules and regulations, not in conflict with the laws of this state, for carrying out the provisions of this act;” and under this authority Regulation 6 was adopted and published, which requires manufacturers of certain proprietary foods, including syrups that are compounds; mixtures, or blends, to state definitely upon the principal label the percentage of each ingredient. It is insisted that the regulation goes beyond the authority conferred upon the state board because it is inconsistent with the definition of “misbranding” contained in the act, and therefore cannot be deemed to be a regulation required to secure freedom from misbranding. Upon this particular point the opinion of the Kansas Supreme Court is silent; but the decision of the district court upon the demurrer sustained the validity of the regulation as being within the authority of the board; the Supreme Court did not overrule this; the question is one of state law; and we must assume that the regulation, having been adopted by the board and in effect sustained by the decision of the Supreme Court, is within the authorization of the statute. This being so, it must be treated as an enactment proceeding from the legislative power of the State; and hence it stands upon precisely the same basis as the requirement of the Indiana statute (quoted in
The Food and Drugs Act of Congress has* not been changed in any material respect from the form it bore when Savage v. Jones arose. By Acts of August 23, 1912, c. 352, 37 Stat. 416, and March 3, 1913, c. 117, 37 Stat. 732, § 8 has been amended, but not in any manner that affects the present question.
The fact ‘ that -the Kansas statute mutatis mutandis follows quite closely the federal act, and that § 8 defines the term “misbranded” almost in the very words of the corresponding section of the-act of Congress, with the significant difference in the final proviso to which we have called- attention, is not dispositive of the question whether Congress has covered the field to the exclusion of state regulation. This is to be determined by what the act of Congress omits, not by what it contains; and by considering whether, in words or by necessary implication, Congress has prohibited the States from making any regulation in respect of the omitted matter. Further argument upon the question is foreclosed by the decision in Savage v. Jones that an omission from the act of Congress of a provision requiring feeding stuffs transported in interstate commerce to give affirmative information as to the ingredients of the article amounted to a limitation by Congress of the scope of its prohibitions, and that,, although not including that at which the Indiana statute aimed, Congress had not denied to the State, with respect to feeding stuffs coming from another State and' sold in original packages, the power to prevent imposition upon the. public by making a reasonable and non-discriminatory *439 provision for the disclosure of ingredients and for inspection and analysis.
That decision is conclusive also upon this point: that the proviso in § 8 of the federal act that “nothing in this Act shall be construed as requiring or compelling proprietors or manufacturers of proprietary foods which contain no unwholesome added ingredient to disclose their trade formulas, except in so far as the provisions of this Act may require to secure freedom from adulteration or misbranding,”, merely relates to the interpretation of the requirements of the federal act, and does not enlarge its purview or establish a rule as to matters which lie outside its prohibitions.
Savage
v.
Jones
was decided after elaborate argument and upon full consideration. We see no reason to reconsider the conclusion there reached or to deny to the case its proper authority. Its doctrine was followed and applied in
Sligh
v.
Kirkwood,
It is argued that the present case is controlled rather by
McDermott
v.
Wisconsin,
The judgment under review should be
Affirmed.
