CARBOHYDRATE METABOLISM 



[PT. Ill 



® Sakuragi(Momose-Pavy) 

 — Needham (Hagedorn-Jensen) 

 ® Needham (Wood -Osb) 



that at first the total carbohydrate in the whole egg falls, then rises 

 again a little, and afterwards maintains a more or less horizontal 

 course till hatching. In other words, the loss from the yolk and white 

 after the loth day is practi- 

 cally compensated for by the 

 gain of the embryo, but in 

 the earner stages this is not onnL\ 

 the case. Beside the main 

 data on Fig. 266 are placed a 

 few other points, some ob- 

 tained by Sakuragi, using his 

 own method and some which 

 I obtained using that of Wood 

 & Ost; both these depend 

 on the reduction of copper, Fig. 266. 



and gave higher results than 



those of the Hagedorn-Jensen method, but they also show a constancy 

 of total carbohydrate in the latter half of incubation. 



Having ascertained the movements of the total glucose during the 



we may proceed to consider the 



mgms 

 per egg 



O Idzumi 



• Pavy(whiteonly) 

 e Bywaber8(white only) 

 <D SatS 

 ® Tomcta 

 $ Gadaskin 



( Vladimirovai.Schmidtt 

 e Pennington 

 8 Hepburn &_ St. John 

 V Kojo 

 A Morner (white onJ_y) 



* Bernard C. 



chick's development in its egg; 

 movements of the various frac- 

 tions into which it is divided. 



It will first of all be of interest 

 to compare the total carbo- 

 hydrate of the remainder with 

 the uncombined glucose there 

 during the first half of develop- 

 ment. Figures for the free sugar 

 exist in some number in the 

 literature, and, although all are " ' '" 



derived from experiments in °' ' ''" 



which copper reduction methd'ds were used, they are yet worthy 

 of credence, because total hydrolysis with its production of amino- 

 "acids was not involved. Creatinine and glutathione would probably 

 not be present in the protein-free filtrates, so that the objections against 

 copper methods discussed above are not grave in the case of free 

 sugar. 



In Fig. 267 the figures of the various observers for the free glucose 

 are summarised together. The sets of data are twelve in number. 



