I 128 



PROTEIN METABOLISM 



[PT. Ill 



® Cow Ipa^on.WatsonScKerr 

 o Sheep] 



ffl Cow 1 |_j 



a Sheep ) 



id say 



to gain some notion of the relative intensity of its protein catabolism, 



as was so straightforward in the 



case of the chick. Nevertheless, 



the enterprise is not without in- 2 



terest, and Lindsay essayed it, :^ 



using her own figures in con- ^ 



junction with those of Paton, o 



Watson & Kerr. The results are - 



•D 



plotted in Fig. 341, where an ^' 

 unmistakably descending curve ^ 

 is seen, becoming asymptotic to e 

 the time axis. Exactly parallel f 

 tothisarethedataofGriinbaum, s 

 who worked with the cow, esti- §, 

 mating the total nitrogen in 

 the allantoic liquid at different 

 stages of development. His 

 figures, or rather the results 



'^ Sheep 500 



Cow 1000 2000 3000 4000 5000 6000 



Weight of embryo in gms. 



Fig. 341 



calculated from them, are not readily incorporated in the graph of 

 Fig. 341, but are given in Table i6o. 



Table i6o. 



Total nitrogen in the 

 allantoic liquid in 

 Weight of the cow milligrams per loo gm. 

 foetus in grams of foetus weight 



"The waste nitrogen", said Lindsay, "accumulates as the foetus 

 grows, but per unit of weight it markedly decreases." This holds 

 good for all the constituents of the urine, as found from the analysis 

 of the allantoic and amniotic fluids, and a group of descending curves 

 is seen in Fig. 342. Now, if the curve of Fig. 341 be compared with 

 that given in Fig. 325 for the intensity of protein metabolism of the 



