SECT. 8] 



CARBOHYDRATE METABOLISM 



Table 127. 



1005 



Amount of glucose injected 



into the air-space before 



incubation 



( "^ ^ 



Mgm. Mgm. % 



of glucose of egg-white 



o o 



1 00 390 



50 200 



200 800 



Amount of alanine injected 



into the air-spate before 



incubation 



Glucose found in 



the egg on the 3rd 



day of incubation 



(mgm. %) 



White 

 430 

 690 

 510 

 1080 



Yolk 



200 

 200 

 190 

 190 



Mgm. 

 of alanine 



50 



Mgm. %_ 

 of egg-white 



Glucose found in 



the egg on the 3rd 



day of incubation 



(mgm. %) 



White 



410 

 400 



Yolk 



180 

 190 



Tomita proved, in short, that the amount of glucose in the white 

 can be raised on any one day by injecting a supply into it at the 

 beginning of incubation, in spite of the factors which are leading to 

 its disappearance, but that the amount of glucose in the yolk cannot 

 be changed in this way. In 

 passing, it may be noted that 

 the addition of alanine to the 

 egg-white before incubation had 

 no effect on the glucose-content 

 of white or yolk. It would there- 

 fore seem improbable that glu- 

 cose normally passes into the 

 yolk from the white. 



We can now relate the curve 

 for disappearance of free carbo- ^^' 



hydrate with the curves for other carbohydrate fractions. In Fig. 269 it 

 is shown in relation with the curve for total carbohydrate of the non- 

 embryonic part of the ^%g. The total carbohydrate of the remainder 

 falls from zero hour till the 8th day, rises from then till the 1 1 th day, 

 and thereafter falls steadily till the end of development. The free glucose 

 also falls till the loth day, but not quite in the same manner as the 

 total carbohydrate, for at the beginning its fall is slow, and thereafter 

 rapid, while the total glucose first falls quickly, and slows down as 

 time goes on. The latter part of the curve for free glucose, as shown 



