SECT. 12] GYCLOSES, PHOSPHORUS, SULPHUR 



1203 



Attention may now be directed to the protein phosphorus. As can 

 be seen from both graphs (Plimmer & Scott; Masai & Fukutomi), 

 the increase in nucleoprotein phosphorus does not account for more 

 than a half or two-thirds of the vitelHn phosphorus disappearing. 

 This is seen by the decrease which the total residual protein curve 

 exhibits. Some of the vitellin phosphorus is therefore used to make 

 something else besides nuclein phosphorus. It is very interesting to 

 see that the nucleoprotein phosphorus increase is not only in the 

 embryo, but also outside it, a fact due to the separation made by 

 Plimmer & Scott being between the embryo and membranes, so that 



Plimmer &i Scott 

 P- distribution in embryo not 

 including membranes 



D Ether-soluble P 



■ Inorganic P 



i> Water-soluble organic P 



® Nucieo-protein P 



Plimmer &Scobb 

 P-disbribufcion in remainder 

 70r- including membranes 



□ Ether-soluble P 

 ■ Inorganic P 

 O Viteflin P 

 ® Nucleo-probein P 

 ® Vitellin and nucleo-protein P 

 (not separated) 



Days ■ 



Days-* 5 



Fig. 375- 



Fig. 376. 



the latter were included with the remainder of the egg. This is a 

 demonstration that their content of nuclein is not insignificant. In 

 the embryonic body the percentage of nuclein phosphorus seems to 

 have a peak on the 17th day, but this is probably not real, as 

 the curves are percentage curves and not curves of absolute magni- 

 tude. Doubtless the number of milligrams of nuclein phosphorus 

 increase without a break in the embryo, but after the 17th day the 

 enormous increase of inorganic phosphate in the chick's body causes 

 a diminution in the percentage of nucleoprotein phosphorus. It has 

 been suggested that the manufacture of nuclein proceeds externally 

 to the embryo to some extent, and that the nuclein is absorbed after- 

 wards, and, in view of Sendju's results on the purine content of the 



