228 ANNUAL, REPORT OP THE Off. Doc. 



Make four sub-sample composite for test as under I, using preserva- 

 tive. ^ 



Less time need be spent in mixing skim-milk than with the whole 

 railk or cream. 



V. To test huttermilk or whey. — Draw directly from gate or si- 

 phon ; make use of the composite sample with preservative. 



VI. To check correctness of test at creamery or cheese factory. — 

 (a.) Halving creamery sample. When the creamery composite sam- 

 ple is complete and ready for testing, require the operator to furnish 

 one-half of it. Be certain that the ©ample is thoroughly mixed by 

 pouring, that all the cream from the sides of the jar, cover, etc., is 

 mixed back into the milk or cream, and that the halving is done im- 

 mediately after the last pouring. 



(b.) Duplicating creamery sample. Every time that the party 

 sampling milk or cream at the creamery or on the gathering route 

 samples a patron's milk or cream, the latter may require him to fur- 

 nish a duplicate sample in a jar controlled by the patron. Duplicate 

 composite samples may be made thus which should tested closely 

 alike. 



(c.) Sampling at the dairy. Follow directions under II or III. 



Either of these three methods of checking creamery testing is open 

 to objection. In (a) the sample or testing may be incorrectly man- 

 aged at the creamery, the sample being under control of one of the in- 

 terested parties, the creamery man. In (b) the sample may be im- 

 ■ properly handled by the other interested party, the patron under 

 whose control it is located. Method (c) resembles (b) in this respect, 

 and, moreover, results may be vitiated because of error of insufficient 

 care in sampling. 



The experiment station strongly urges dairymen as far as possible 

 to make use of the Babcock test at their own homes. It is of more 

 value as used between cow and cow than for settling money matters 

 between man and man. 



To such residents of the State as do not consider it advisable to 

 make their own tests, or to have neighbors make them for them, the 

 experiment station offers its services to a limited extent. It cannot 

 do regular and wholesale testing for any individual or company, but 

 will handle small numbers of samples without charge. It makes but 

 few requirements, as follows: 



1. Samples should be carefully taken in accordance with these in- 

 structions. 



2. Wide mouthed jars should be used. 



3. Jars should be filled absolutely full to prevent churning in tran- 

 sit. 



4. Express charges should be prepaid. In case jars are desired 

 back again, the express agent should be asked to allix a "free return 

 empty" label on the package and it will be returned without cost. 



