PHYSICAL AND CHEMICAL EXAMINATION OF MILK 



149 



each time. The ether is finally evaporated and the remaining fat 

 weighed. 



Wollny's Refractometer Method (after Leach). The refractom- 



eter is based on the deviation of light through a solution of fat 

 in ether at 17.5 C., the solution to be prepared according to defi- 



