582 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. 



glyoocoll has obtained a body insoluble in water, but swelling in it, forming a 

 gelatinous mass. The substance gives the biuret reaction, is insoluble in 

 alcohol and dilute hydrochloric acid, but dissolves in pepsin-hydrochloric 

 acid. These reactions show its kinship to gelatin. Lilienfeld likewise de- 

 scribes a synthetically formed peptone and a coagulable proteid, 1 the peptone 

 formed principally through condensation of the above-described product with 

 the ethyl-esters of the amido- bodies, leucin and ty rosin, the proteid from the 

 same with addition of formic aldehyde. Grimaux likewise has produced, 

 with other reagents, colloids which resemble proteids. Probably none of 

 these substances are native proteids, but they furnish indications of lines of 

 attack for the future mastery which in time is sure. 



1 Verhandlungen der Berliner physiologischen Gesellschaft, Archiv fur Physiologie, 1894, 

 S. 555. 



