THE BABCOCK TEST 41 



f. Add hot acidulated water, so as to bring the fat 

 up to the 8 per cent mark. Give it a final whirling 

 for two minutes. 



g. Take bottles out of tester and place in water 

 bath for four or five minutes. 



Precautions 



av Never open the tester while the bottles are in 

 motion. 



b. Both milk and acid should be about room tem- 

 perature. Do not use hot acid or hot milk. 



c. Always have a bottle of ammonia water handy 

 to use in case of an aceident. If acid comes in con- 

 tact with clothing, immediately use cold water and 

 then ammonia water. 



d. In case acid is accidentally spilled on the hands 

 or the face, wash off at once with plenty of cold water. 

 In case of a serious burn, consult a physician. 



LABORATORY PROBLEMS 



"VI. To Determine the Importance of Thoroughly Mixing 

 the Sample Just Before Taking Sample with a Pipette 



a. Mix well a sample of milk. Test it at once. 



b. Allow the sample to stand for ten minutes. 



c. Take a sample with a pipette from the top of 

 the milk. Test. 



d. Take another sample from the bottom of the 

 milk. Test. Compare results. Can you account for 

 the difference in the tests obtained? 



