16. Inspectors of milk shall institute complaints for violations of the provisions of the three preceding sections when they have reasonable cause to believe that such provisions have been violated, and on the information of any person who lays before them satisfactory evidence by which to sustain such complaint. Said inspectors may enter all places where butter or cheese is stored or kept for sale, and said inspectors shall also take specimens of suspected butter and cheese and cause them to be analysed or otherwise satisfactorily tested, the result of which analysis or test they shall record and preserve as evidence; and a certificate of such result, sworn to by the analyser, shall be admitted in evidence in all prosecutions under this and the three preceding sections. The expense of such analysis or test, not exceeding twenty dollars in any one case, may be included in the costs of such prosecutions. Whoever hinders, obstructs, or in any way interferes with any inspector, or any agent of an inspector, in the performance of his duty, shall be punished by a fine of fifty dollars for the first offence, and of one hundred dollars for each subsequent offence. [Sidenote: Terms “butter” and “cheese” defined. Public Statutes, chap. 56, § 21.] 17. For the purposes of the four preceding sections the terms “butter” and “cheese” shall mean the products which are usually known by these names, and are manufactured exclusively from milk or cream, with salt and rennet, and with or without colouring matter. [Sidenote: Portion of sample to be reserved for defendant. 1884, 310, § 4.] 18. Before commencing the analysis of any sample the person making the same shall reserve a portion which shall be sealed; and in case of a complaint against any person the reserved portion of the sample alleged to be adulterated shall upon application be delivered to the defendant or his attorney. OF THE SALE OF CHOCOLATE. [Sidenote: Chocolate, how to be stamped. Public Statutes, chap. 60, § 8.] 28. No manufacturer of chocolate shall make any cake of chocolate except in pans in which are stamped the first letter of his Christian name, the whole of his surname, the name of the town where he resides, and the quality of the chocolate in figures, No. 1, No. 2, No. 3, as the case may be, and the letters MASS. [Sidenote: Ingredients of.] [Sidenote: Boxes, how branded. Public Statutes, chap. 60, § 9.] 29. Number one shall be made of cocoa of the first quality, and number two of cocoa of the second quality, and both shall be free from adulteration; number three may be made of the inferior kinds and qualities of cocoa. Each box containing chocolate shall be branded on the end thereof with the word chocolate, the name of the manufacturer, the name of the town where it was manufactured, and the quality, as described and directed in the preceding section for the pans.