

DAIRY PRODUCTS. 

 TABLE No. 11. Percentage of milk sugar. 



Ill 



SUMEN REMAINING IN FILTRATE FllOM LEAD ACKTATE AND MERCURIC IODIDE 



SOLUTIONS. 



From the fact that the polariseopic readings show that solutions of 

 milk prepared with lead acetate have a lower rotating power than those 

 prepared with mercury salts, it is to be inferred that the lead n agent 

 either leaves certain soluble and transparent kinds of albumen in solu- 

 tion, or else dissolves a portion of those which are at iirst precipitated. 

 To test the accuracy of this supposition a few analyses were made to 

 determine the amount of albumen left in the filtrate from the lead and 

 mercury reagents. At the same time different quantities of the mer- 

 curic iodide solution were used, in order to determine the amount which 

 would give the best results. For GOcc. milk the quantity of mercuric 

 iodide to be used should be 25cc. to 30cc. 



In the following table will be found the percentages of albumen in 

 the whey after precipitating with the reagents noted and filtering. 

 Ten cubic centimeters of the filtrate were evaporated to dry ness in a 

 thin glass dish, and the dried residue (with tlie glass) burned with soda 

 lime. The calculated nitrogen was then multiplied by 0.25 and the pro- 

 duct taken as the percentage of albumen : 



TABLE No. 12. Per cent, albumen infiltrate. 



j 



/I 



