ago 



THE UNFERTILISED EGG AS A 



[PT. Ill 



Table 19. 



Per cent, of dry weight 



Levene & Alsberg's figures. 



Avivitellic acid ... 13-13 



Swigel & Posternak's figures. 



0-57 



Swigel & Posternak's figures. 



Hydrolysis of ovotyrine b^ (% ) 

 Pyruvic 

 H3PO4 acid NH3 Arginine Histidine Lysine 



12-00 1-60 4-90 0-62 0-70 0-75 



1-32/1 



/-serine 

 7-90 



Table 20. Nitrogen distribution. 



Plimmer's figures (1908). 



Per cent of dry weight 



Ovoalbumen 

 Casein 



Ovovitellin . 

 Ovolivetin . 



Total 



N 



15-51 

 15-30 

 15-29 

 15-12 



Amide 



N 



1-34 



1-52 

 0-84 

 0-75 



Humin 



N 

 0-29 

 0-22 

 0-25 

 0-32 



Diamino 



N 



3-30 

 330 

 3-84 

 3-29 



Mono- 

 amino N 

 10-58 

 10-36 

 10-26 

 10-76 



linkages must break, therefore, between a carboxyl group and pro- 

 line, tr-yptophane, histidine or arginine. 



Weyl ; v. Moraczevski ; and Gross were the first to describe the 

 properties of the egg-yolk proteins, but the standard account is that 

 of Plimmer, who in 1908 identified two yolk-proteins, ovovitellin, 

 and ovolivetin. Ovovitellin, according to his analyses, contained 

 1*0 per cent, of phosphorus, but ovolivetin only o-i per cent. He was 

 usually able to isolate far more of the former than the latter, but in 

 some experiments the yield seemed to be nearly equal. Livetin was 



