390 Milk and Its Products 
factories. No person shall sell, supply or bring to be manufactured to 
any butter or cheese factory any milk from which there has been kept 
back any part of the milk commonly known as strippings, or any milk 
that is sour, except pure skim milk to skim-cheese factories. The owner 
or proprietor or the person having charge of any butter or cheese fac- 
tory, not buying all the milk used by him, shall not use for his own 
benefit, or allow any of his employees or any other person to use for 
his own benefit, any milk, cream, butter or cheese or any other prod- 
uct thereof, brought to such factory, without the consent of the owners 
of such milk or the products thereof. Every butter or cheese manufac- 
turer not buying all the milk he uses, shall keep a correct account of 
all the milk daily received, of the number of packages of butter and 
cheese made each day, and the number of packages and aggregate 
weight of cheese and butter disposed of each day; which account shall 
be open to inspection to any person who delivers milk to such factory. 
Whenever manufacturers of butter or cheese purchase milk upon the 
basis of the amount of fat contained therein and use for ascertaining 
the amount of such fat what is known as the Babcock test, or when- 
ever the proceeds of co-operative creameries and cheese factories are 
allotted on the basis of determinations of milk fat by the Babcock test, 
the bottles and pipettes used in such test shall before use be examined 
by the director of the New York agricultural experiment station. If 
such bottles are found to be properly constructed and graded so as to 
accurately show the amount of fat contained in milk, each of them shall 
be legibly and indelibly marked “‘S. B.’’ No bottle shall be so marked 
except as herein provided or used in any such test by such manufac- 
turers, unless so examined and marked. The acid used in making such 
test by such manufacturers shall be examined from time to time by 
competent chemists employed by the Commissioner of Agriculture and 
if found not to be of sufficient strength the use of such acid shall be 
prohibited. No person or persons receiving or purchasing milk or cream 
upon the basis of the amount of fat contained therein shall credit any 
patron or patrons delivering milk or cream thereto with a greater or 
less percentage or average percentage of fat than is actually contained 
in the milk or cream so delivered. The Commissioner of Agriculture or 
persons employed by him for that purpose may at any time assist in 
making tests of milk received at a butter or cheese factory for the 
purpose of determining the efficiency of tests usually made at such 
factory. All persons using other than standard bottles or acid which is 
not of the required strength to accurately determine the amount of fats 
in milk or crediting any patron or patrons delivering milk or cream 
