THE ANALYSIS OF MILK 29 



carefully decanted from any residue ; by successive 

 treatments with small quantities of petroleum ether 

 all the fat may be removed, and the flask, with any 



FIG. 19. Soxhlet Extractor. 



small particles of kieselguhr that may have passed 

 into it, re-weighed. 



The Werner- Schmid Method. Pipette 10 c.c. of milk 

 into a Stokes tube (Fig. 20), add 10 c.c. of strong 

 hydrochloric acid, and heat over a flame with constant 

 shaking, till the fat, on standing a short time, collects in 

 a clear layer on the surface ; cool the contents of the 



