the same to be paid by the persons or corporations for whom it is 

 rendered. 



Sec. 3. Within six months after this act takes effect, and once 

 each year thereafter, the director of the Massachusetts' Experiment 

 Station, or his authorized agent, shall inspect at the expense of the 

 owners all centrifugal or other machines used by any person, firm or 

 corporation, or by any agent or employee thereof, for the testing of 

 milk or cream in fixing the value thereof ; and the director of the 

 experiment station or his authorized agent shall cause all such 

 machines to be put into condition to obtain accurate results with the 

 Babcock test or other tests, at the expense of the owners thereof. 

 Such machines may be replaced by new ones at the option of the 

 persons to whom they belong. 



^Sec. 4. No person shall, either by himself or in the employ of 

 any other person, firm or corporation, manipulate the Babcock test 

 or any other test, whether mechanical or chemical, for the purpose 

 of measuring the butter fat contained in milk or cream as a basis 

 for determining the value of such milk or cream, or of butter or 

 cheese made from the same, without first obtaining a certificate 

 from the director of the Massachusetts" agricultural experiment sta- 

 tion that he or she is competent to perform such work. Rules 

 governing applications for such certificates and the granting of the 

 same shall be established by the said director. The fee for issuing 

 the said certificate shall in no case exceed two dollars, shall be paid 

 by the applicant to the said director, and shall be used in meeting 

 the expenses incurred under this act. If the duly authorized 

 inspector finds an operator who, after receiving his certificate of 

 competency, is not, in the judgment of the inspector, correctly man- 

 ipulating the Babcock or other test used as a basis for determining 

 the value of milk and cream, or who is using dirty, untested or 

 otherwise unsatisfactory glassware, he shall immediately report the 

 case in writing to the director of the station. The director shall at 

 once notify said operator in writing and give him not less than 

 thirty days to make the necessary improvements. At the expiration 

 of that time the director may order a second inspection, the cost of 

 which shall be borne by the operator or by the person, firm or cor- 



^ Massachusetts substituted for Hatch. See Chapter 66, Acts and Resolves of Massachu- 

 setts for 1907. 

 3As amended Chapteri425, Acts and Resolves|for 1909. 



J 



