96 



Milk and Its Products 



acid. The most essential feature of the glassware 

 is that it should be accurately graduated. This in 

 general can be secured by always procuring the 

 glassware from a reliable manufacturer or dealer, 



Fig. 14. Forms of Babcock test bottles ; a, ordinary bottle for whole 

 milk ; b, bottle for skim milk, using double charge of milk ; 



c, Ohlsson, or "B. & W." double-necked bottle for skim milk ; 



d, e, bottles for testing cream ; /, bottle with detachable neck ; 

 g, h, detachable necks for butter and cream. 



though suspected glassware may be tested with com- 

 paratively little difficulty. The neck of the ordinary 

 test bottle is graduated from to 10, each divi- 

 sion being subdivided into five parts. The gradua- 

 tion from to 10 will contain a volume of melted 



