52 



Refraction of milk sera from known purity milk of individual cows. 



Mixed milk of known purity. 



THE DETECTION OF CALCIUM SUCRATE IN MILK OR CREAM. 



The calcium sucrate used in this investigation was prepared by adding 2.5 parts, by 

 weight, of sugar to 1 part of quick lime slaked in 8 parts of water, allowing to settle, 

 and decanting the supernatant liquid. The sample polarized at 17.3 V. in the 200 mm 

 tube and its alkalinity was 1.86 normal. 



Leffmann's method for the detection of calcium sucrate in cream, using sesame oil 

 and hydrochloric acid as the reagents, was found to be satisfactory only in the presence 

 of larger quantities than are necessary to thicken cream, therefore it was abandoned. 



The method of Baier and Neumann^ was found to be entirely satisfactory for the 

 detection of sugar, and is as follows: 



Chem. Ztg., 1906, 30: 638. 



6 Zte. Nahr. Gemissm., 1908, 16: 51. 



