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 ^ report four compounds with Hme, 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 NH4, 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: 



N „ 

 1 c,c. — NaOH equals 

 10 



1 gram Caseiaogen 

 equals 



Lacqueur and Sackur 



Mathaiopoulos 



Long 



Van Slyke and Bosworth . . 



. 1138 gr. caseinogen 



0.11315 



0.1124 



0.1111 



8.81 c.c. ^NaOH 



8.84 

 8.90 

 9.00 



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^ regarded 

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

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



