THE TESTING OF MILK AND CREAM 



115 



sample into the pipette and fill the pipette to the 17.6 c.c. mark. 

 Discharge the pipette into the test bottle. In order to do this 

 rapidly and to prevent spilling, drop the discharge end of the 

 pipette into the neck of the test bottle until the bulb of the 



Fig. 12. — The 

 17.6 c.c, standard 

 pipette for milk. 



The wrong way 



The right way 



Fig. 13. — Manner in which the tests should be 

 transferred to the bottle. 



pipette rests on the neck of the bottle, then release the milk. 

 Blow the last drop of milk out of the pipette before removing it 

 from the bottle. Mark each bottle with a number correspond- 

 ing with the name or number of the respective patron on the 

 test sheet. The marking is best done with a lead pencil. 



Adding acid (Figs. 14, 15) 



Use commercial sulfuric acid, specific gravity 1.82 to 1.83. 

 The temperature of the acid should be the same as that of the 



