EXPERIMENTS WITH CHRVSOMEL1D BEETLES. 



animals increases. That there is a corresponding prenatal de- 

 cline in the rate of growth was shown by means of rabbit embryos. 

 Curves representing the change in the rate of growth with age 



. 3. 



. I : 



I- 1C. 1. 



3 6 8 10 



Age in days. 



33 



FIG. 2. 



33 



. 



33 



have been on-tnirtrl for the embryos and young of many 

 aiiimaK, ami almost without exception the growth-rate declines 

 as development proceeds. 



