Useful Rules and Tests 3859 
iron; the surface of the curd, melted by the heat, sticks to the iron, 
and the remainder is carefully and gently pulled away. If the curd is 
very immature, the melted part readily separates from that not affected 
by the heat, but when more mature, numerous fine threads of casein 
are drawn out when the two parts are separated, the length of these 
threads depending upon the maturity of the curd, and commonly meas- 
ured in terms of acid, thus, 3-inch acid, 2-inch acid, etc. 
To Cauiprate on Test THm Accuracy OF GRADUATION OF 
GuasswaRE UsEpD IN THE Bascock Trst 
Observe that the graduations are at equal distances apart. Fill 
the bottle carefully to the 0 point with clean rain water, wipe out the 
neck carefully, and add from a pipette or burette 2 c. c. water. It should 
fill the bottle exactly to the 10 point. Or, weigh the bottle filled with 
clean rain water to the 0 point with delicate balances, fill to the 10 
point and weigh again. The difference in weight should be 2 grams. 
Or, into a dry, empty bottle put 2 c. c. or 27.18 grams mercury, insert 
a tight-fitting plug carefully to the 10 point, and invert the bottle; the 
mercury should just reach to the 0 point. The pipette should hold 17.6 
grams of water, or 239 grams of mercury. Any piece showing « dis- 
crepancy of 2 per cent should be discarded. 
To Test Burrer oR CHEESE WITH THE Bascock Tzst 
Weigh out on a balance sensitive to .1 gram, from 4 to 8 grams of 
the substance to be tested. Divide into small pieces and put into an 
ordinary test bottle, or bottle with detachable neck, with about 10 
c. c. of warm water. Add the acid, and complete the test in the ordinary 
way. The percentage of fat will be found by the following proportion: 
Weight of sample: 18 :: observed reading : per cent of fat; or 
18 X observed reading 
weight of sample 
e. g.: 4.8 grams of cheese tested, showed a reading of 9.2 per cent 
fat in the test bottle. The cheese contained: 
18 X 9.2 
4.8 
=per cent of fat; 
= 84.5 per cent fat. 
Taz Cornet, Burrer Moisturs-TEst 
The apparatus used in the Cornell moisture-test is an alcohol lamp, 
stand, asbestos sheet, hot-pan lifter, aluminum cup for holding the 
