162 Animal Husbandry 
268. Sampling the milk.— The milk to be tested should be 
thoroughly mixed just before sampling. To do this, pour back 
and forth between two vessels several times. With the pipette, 
measure out 17.6 c.c. of milk, and place in the test-bottle. To 
do this, suck the milk up above the 17.6 c.c. mark. Quickly 
place the index finger over the upper end of the pipette, then by 
releasing the pressure allow the milk to run down to the 17.6 c.c. 
mark. Place the point of the pipette into the test-bottle neck, 
holding both pipette and bottle at an angle, then remove the finger 
to allow the milk to flow into the bottle. To be sure that every 
drop is out of the pipette blow through it into the test-bottle. 
The sampling should be done in duplicate to make sure of the 
results. 
269. Using the acid. — Much care should be exercised not to 
spill the sulfuric acid on the hands, clothing, or floor. Should 
any be accidentally spilled, pour on plenty of water, than add a 
little lime or baking soda. Always keep water and lime at hand 
for this purpose. 
After all the samples of milk to be tested have been measured, 
the acid should be added. To do this, fill the acid measure to the 
17.5 c.c. mark, and gradually pour into the test-bottle, holding the 
bottle in a slanting position. By turning the bottle the acid will 
carry down all particles of milk left in the long neck. Hold the 
‘bottle by the neck and give it a circular motion for a few moments, 
thus mixing the milk and acid until no milk or clear acid is visible. 
The contents of thé bottle should be dark colored and hot. Do 
not allow the bottle to stand too long before mixing or the test 
will not be clear. ; 
270. Whirling the bottles. — The bottles and machine should 
be hot; and if it is not a steam machine, use boiling water to 
warm it. Place the bottles in the machine so that each will 
have another directly opposite to keep the machine in balance. 
Whirl five minutes. .Then stop, and with the pipette or a cup 
with small spout, add hot water to each bottle until the contents 
