THE BIO-CHEMISTRY OF ANIMALS AND PLANTS 699 



It might be mentioned finally that, amongst the vegetable 

 proteins, albumose-like substances have also been met with, 

 but their existence as such in seeds is doubtful. Small 

 quantities of peptones have also been observed. 



Typical nucleo-proteins occur in plants. The nucleic acid, 

 isolated by Kossel from yeast, was the first substance of this 

 type known. Osborne and Harris have lately isolated and 

 investigated very thoroughly a nucleic acid from wheat em- 

 bryos. It furnishes characteristic purine bases on hydrolysis. 



(To be continued) 



