96 THE CLEAVAGE PRODUCTS OF THE NVCLEOPROTEIDS. 



The structural composition of the nucleinic acids is still largely 

 sub judiee. For triticonucleinic acid Osborne has suggested the fol- 

 lowing formula, in which x represents an as yet unresolved residue : 



/OH 

 C 6 H 9 5 -P\C 5 H 9 5 



O 

 OH-/P C,H 3 N 2 2 



X O 



OH P OH 



\) 4 H 3 N 2 2 



OH 

 For guanylic acid Bang has suggested the structural formula : 



OH X/ OH /OH 



C 5 H 4 N 5 -0-P-0 



O 



I /OH 



C 5 H 4 N 6 -0-P-0-C 3 H 5 <^ 



/OH 

 C 5 H 4 N 6 -0-P-0-C 3 H 5 \ 



I X 



C 6 H 4 N 5 O P OH 



/\ 

 HO OH 



Some nucleinic acids, such as thymonucleinic acid, contain iron 

 in masked form. 



As I have already indicated, the native nucleinic acids on hydro- 

 lysis lose a portion of their xanthin bases and give rise to the for- 

 mation of /9-nucleinic acid. On further decomposition the remain- 

 ing xanthin-bases are split off together with another basic substance 

 which has been termed cytosin. A body then remains which con- 

 tains the residual radicles of the nucleinic acid molecule. This 

 Kossel and Neumann have termed thyminic acid. For its barium 

 salt they obtained the formula C 14 H 2S N 3 O 1 2P 2 Ba, and in the case of 

 the thyminic acid resulting from triticonucleinic acid Osborne has 

 suggested the structural formula : 



