The Babcock Test. 



31 



The best and safest manner of holding the bottle and 

 the pipette in this transfer is shown in fig. 7. Fig. 8 

 shows a position which should be avoided, since by hold- 

 ing the bottle in this way, there is a danger that some of 

 the milk may com- 

 pletely fill the neck 

 of the bottle, and as a 

 result, flow over the 

 top of the neck. 



Pipettes, the lower 

 part of which slip 

 readily into the necks 

 of the test bottles, 

 may be emptied by 



lowering the pipette }/* into the neck of the bot- 

 tle till it rests on its rim, 

 when the milk is allowed 

 to' run into the test 

 bottle. 



37. Adding acid. The 

 acid cylinder (fig. 9) 

 holding 17.5 cc., is filled 

 to the mark with sulfuric 

 acid of a specific gravity 

 of 1.82-1.83. This 

 amount of acid is care- 

 fully poured into the 

 test bottle containing the 

 milk. In adding the 

 acid, the test bottle is conveniently held at an angle 

 (see fig. 7), so that the acid will follow the wall of the 

 bottle and not run in a small stream into the center of 

 the milk, the bottle being slowly turned around and the 



FIG. 7. The right way of emptying 

 pipette into test bottle. 



