26 



CHESTER A. STEWART. 



of nuclear material in embryonic cells accounts in part for the 

 greater intensity of embryonic growth, we may in part account 

 for the rapid growth following inanition upon the same principle, 

 the changed nucleus-plasma relation. For it is well known that 

 360 



20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 



Age in Days 



CHART C. Males. Chart showing the curve of growth of the test male rats 

 refed after maintenance trom three to ten weeks of age, superimposed upon that 

 of the control males, so that the starting points coincide. The curves are drawn 

 through points representing the aveiages of the individual weights of the rats of 

 litters S8, Sg and 814, at the various periods. Body weight in grams is represented 



on the ordinate and age in days on the abscissa. Controls. 



Rats refed after seven weeks of maintenance. 



during inanition the cell nucleus becomes relatively large, the 

 loss of substance being greater in the cytoplasm. Thus inanition 

 tends to reduce the body cells to an embryonic condition, as 

 found by Child ('15) in extensive experiments upon Planarians. 

 It is also possible that the accelerated growth following periods 



