202 DIRECTIONS FOR MAKING THE BABCOCK TEST 



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C.C. 



end of the pipette and the finger dry when measuring 

 milk, as it is almost impossible gradually to lower the 

 milk if the finger is wet. Next, 

 place the point of the pipette in 

 the mouth of one of the test bot- 

 tles, held in a slightly slanting 

 position so that the milk can flow 

 down the side of the tube, and re- 

 move the finger, allowing the 

 milk to flow into the bottle. After 

 waiting a short time for the 

 pipette to drain, blow into the 

 upper end to expel all the milk. 



Adding the Acid When the 

 milk has been measured into the 

 test bottles, the necessary amount 

 of acid may be added immedi- 

 ately or the bottles may be left 

 for a day or two without mate- 

 rially changing the results. 



The amount of acid required 

 for a test is about the same as that 

 of the milk, 17.5 c. c. for the 

 ordinary test. If too little acid is 

 added, the casein is not all held in 

 solution throughout the test, and 

 an imperfect separation of the fat 

 results. If too much acid is used, 

 the fat itself is attacked. Great 

 care must be taken in handling the 

 acid to avoid getting any of it on the skin or clothing. 



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