PARANUCLEIN FROM CASEIN. 



399 



Total phosphorus = j Phosphorus found in ash = 0.14 % . 



Phosphorus in substance in organic combination = 2.76%. 

 As in the case of E, the ash content was relatively small and 

 practically all the phosphorus existed as organic phosphorus, 

 i.e., disappeared on ignition. 



The following summary will assist in the comparison of 

 the analyses of the products obtained. 



It will be observed at a glance that the retention of phos- 

 phorus in the ash of the preparation, and accordingly the 

 apparent absence of organic phosphorus in the substance, is 

 associated with those preparations only which have a high 

 ash content (A and D). That this condition is not attribut- 

 able to the dialysis of the product is evidenced by the fact 

 that A, D, and P were each subjected to the process and that 

 the ash content of the preparation is in no way related to this 

 part of the procedure P being one of the purest products 

 obtained, whereas A and D, dialyzed under similar conditions, 

 showed a very high ash content. The only respect in which 

 the preparations A and D differed materially from P, was in 

 the fact that, whereas the former were precipitated from their 



