( 5 ) 

 The Pink Albumen 



Laboratory Number of Days Per Cent Protein in Dry Per Cent Fat in 



Number of Egg Incubated Matter IN. x 6.25) Dry Matter 



67 3 31.64 55.08 



82 5 26.31 65.50 



70 6 25.44 60.12 



73 6 26.87 56.82 



76 6 25.87 61.91 



58 7 28.62 59.46 



61 7 28.31 56.31 



64 7 28.37 54.96 



79 8 28.12 55.89 



55 11 26.12 66.07 



52 12 25.06 69.71 



The variations shown in the analytical figures are due in part, no 

 doubt, to incomplete separations of the different parts. It is not pos- 

 sible to make as complete a separation of yolk and white in the incu- 

 bated egg as in the fresh egg. 



By reference to the table of analyses of the yolk, it will be seen 

 that the percentage of fat in the yolk remains practically constant 

 throughout the twelve days of incubation. At the end of this period 

 it also has the same approximate size and the same moisture content. 

 This indicates that the fat found in the albumen is derived not wholly 

 from the yolk, but mainly from another source, the albumen itself. 

 Thus the question is raised as to whether the bulk of nourishment 

 prov led the embryo is in the lorm of protein or fat. 



It was found that there was no change in color or composition in 

 the infertile egg, even after five days of incubation. 



Later in this paper are described experiments showing the effect 

 in composition of the egg of a ration high in protein and also the effect 

 of a ration high in fat, together with observations on the vitality of 

 the chicks from these eggs. 



STUDY OF THE YOUNG CHICK 



To study the absorption of the yolk by the chick, young chicks 

 were killed and examinations were made of the yolk and of the chick. 



The Yolk 



Number Age of Chick Weight of Chick Per Cent Per Cent 



of from which from which taken Race of Fat of Protein 



Chick taken Grams in Yolk in Yolk 



2872 1 day 33.41 Strong 35.50 48.50 



2892 2 days 31.85 Weak 43.10 48.50 



487 2 days 31.57 Weak) 26.62 



498 2 days 31.26 Weak f 



511 2 days 32.87 Strong 30.81 



M 2 days 32.80 Strong] 



N 2 days 32.64 Strong)- 36.75 51.87 



O 2 days 32.06 Strong] 



499 3 days 35.59 Weak 23.22 



503 3 days 38.92 Strong) 21.70 



507 3 days 42.15 Strong} 



