RESULTS OF ANALYSIS 



were separated off in the production of peptone which accounts for the 

 different figures for gelatin peptone. 



The qualitative differences observed by the older workers, Kiihne, 

 Chittenden, Neumeister, and the analytical differences in the case of 

 Witte's peptone observed by Pick have not been found. The 

 generally accepted view that heteroalbumose contains more hexone 

 bases than protoalbumose is not confirmed. We may note that 

 heteroalbumose contains more glutamic acid than protoalbumose, and 

 that it contains I per cent, more histidine. 



Skraup and his pupils have made numerous analyses of various 

 intermediate products. Skraup and Krause [1910, I, 2] analysed the 

 derivatives of caseinogen. Proteose I. contained more glutamic acid 

 and more tyrosine than caseinogen ; proteose II. contained less glutamic 

 acid but more tyrosine, and the peptone contained more glutamic acid 

 and no tyrosine. 



Skraup with Zwerger [1905] and with Witt [1906] examined the 

 substances termed kyrins by Siegfried and came to the conclusion that 

 they are mixtures. They found that gelatin-kyrin contained 50 per 

 cent, of di-amino acids and casein-kyrin 80 per cent., the former being 

 composed of I molecule of arginine, I molecule of histidine, I mole- 

 cule of glutamic acid and 2 molecules of glycine, the latter of I mole- 

 cule of arginine, 2 molecules of lysine and I molecule of glutamic 

 acid. 



Skraup with Lampel [1909], with Hummelberger [1909], and with 

 Wober [1909] gave the following data for the protein and for those pro- 

 ducts formed by the action of alkali, which were first prepared by 

 Paal : 



