CASEINOGEN 



9 



spectively. Lehmann's material as separated by filtration 

 contained 1.02 to 1.25 per cent of Ca. Van Slyke and Bos- 

 worth 1 report four compounds with lime, containing 0.22, 0.44, 

 1.07, and 1.78 per cent of Ca. They also prepared compounds 

 with ammonia, sodium, and potassium, containing 0.20 per 

 cent NH 4 , 0.26 per cent Na, and 0.44 per cent K. 



The acidity of caseinogen has been determined by many 

 observers with fairly good agreement. The more important 

 results are: 



From the analysis of the lime salts, Van Slyke and Bosworth 

 regard caseinogen as an octobasic acid and classify these salts as 

 follows : 



From a consideration of the dissociation values of caseino- 

 genates in dilute solutions, Lacqueur and Sackur 5 regarded 

 caseinogen as either a penta or hexabasic acid but a later inves- 

 tigation of the physical properties by Robertson 6 shows that it is 



