116 LAIBY CHEMISTRY 



than the Babcock test, and hence are used but little. 

 Some of the methods, as the Pioscope and the Lacto- 

 scope, do not give accurate results. 



The Beimling method is quite similar to the Bab- 

 cock test, a centrifugal being used. The test bottles, 

 however, are smaller, and two acids instead of one 

 are employed. Amyl alcohol is required, and this is 

 apt to be impure and cause too high results. 



The Lactocrite method has been in use in Ger- 

 many and Denmark for some time. The separation 

 of the fat is made by means of acetic and sulphuric 

 acids, combined with centrifugal action. In its 

 workings the Lactocrite is quite like the Babcock 

 test. The centrifugal used is in form like the Alpha 

 separator. The method gives reliable results. It is 

 patented and the apparatus expensive. 



With Gerber's butyrometer test, the fat is sepa- 

 rated by centrifugal action aided by sulphuric acid 

 and amyl alcohol. This method combines the more 

 important features of the Babcock and the Beimling 

 methods. It gives accurate results and is quite 

 extensively used in Europe. 



Short" s llethod. ■ — In this test an alkali solution is 

 first added to the milk, which changes the fat into 

 soap ; the soap is then converted into insoluble fatty 

 acids by adding sulphuric acid, and the fatty acids 

 are measured in a graduated tube. The test bottles 

 are similar to those used in the Babcock test. 



In Cochrane's method the fat is separated by the 

 combined use of sulphuric and acetic acids and 



