

B9R 1). | Report OF THE CHEMIST OF THE 
by the deep-setting process in Cooley cans and vat, in water at a — 
temperature of about 40° F. The “Baby” separator was run at 
a speed of 6,200 revolutions per minute and the temperature of 
the milk was from 85° to 90° F. 
The following averages from ten cows indicate the difference in 
the results obtained by the two methods: * 
i Gravity “Baby” 
method. Separator. 
Pounds of milk required to make one pound of butter, 32.04 23.17 
Per cent. of milk-fat recovered in cream........... 78.5 97.9 
Per cent. of milk-fat recovered in butter .......... 70.2 93.0 
Pounds of butter ‘per monynin,. . ..... 6. eee 15.9 20.7 
In the case of one animal, whose milk at all times has refused 
fo cream by any gravity process employed, the yield of butter was 
increased from 13.9 pounds to 24.1 pounds by using the separator. 
‘The average gain was a little less than five pounds. 
XX. ANALYSES OF MATERIALS USED IN SPRAYING 
PLANTS. 
Most of the substances commonly used at present in spraying 
plants contain some compound of copper; in some instances the 
copper compounds and other necessary materials are purchased 
separately, and the mixing is done at home, while, in other cases, 
special preparations, containing copper compounds and other ~ 
essential ingredients, mixed ready for application, which are 
found in the market, are used. The sale of copper compounds in 
the form of crude materials and of special preparations has 
increased enormously in the past year or two and, therefore, 
offers an inviting field for adulteration and imposition. 
During the past year, the chemist has examined several copper 
compounds separately and also some of the special preparations 
that are being put upon the market. The investigation was 
undertaken with a view to finding out something in regard to the 
following points : 
‘1. Whether copper compounds are adulterated. 
2. To what extent they are adulterated, if at all. 
38. Whether the special preparations put,on the market are 
pure; whether they are mixed in proper proportions, and whether 
they are offered for sale at reasonable prices. 

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