54 3IiU' 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. 5. 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 



