1 V t H a 



BABCOCK-TEST FOR MILK-FAT. 51 



graduated bottle, a 17.6 c.c. (cubic centimetres) 

 pipette, a 17.5 c.c. acid measure, commercial sul- 

 phuric acid, a centrifugal machine, and hot water. 



The bottles should be made of heavy glass and 

 should hold about 40 c.c. The neck of the bottle is 

 graduated into ten large spaces, each of which repre- 

 sents one per cent. Each large space is divided into 

 five smaller ones, representing two-tenths of one per 

 cent. each. The volume of the graduated space should 

 be 2 c.c. The bottles should be numbered, preferably 

 by etching on the glass, and it is advisable to have 

 the bottles numbered consecutively. 



The pipette should have a rather wide opening at 

 the lower end for rapid delivery, and should be small 

 enough in the lower part to drop readily into the neck 

 of the bottle and allow room for the air to escape as 

 the milk flows in. The 17.6 c.c. mark, for ease in fill- 

 ing, should be four or five inches from the upper end. 

 The acid measure should have a good-sized base, 

 a lip on one side for pouring, and a plain mark on 

 the side showing the proper quantity to use, viz., 

 17.5 c.c. 



The sulphuric acid should have a specific gravity 

 of 1.82 to 1.83. This should be kept in a tightly 

 stoppered bottle, and in a safe place. Great care 

 should be taken in handling this acid, as it is very 

 corrosive. If spilled on the hands or face, it should 

 be washed off at once with plenty of water. Am- 

 monia will restore the color on clothing which is not 

 burned with the acid. 



The centrifugal machine should be from twelve to 



