1894.] The Energy of Evolution. 219 
expect that it would be everywhere affected in the same way. 
The particular kind of germ whence the hair sprang 
that was induced to throw out a new variety in the cells near- 
est the surface of the body under certain changed conditions 
of climate and food, might be expected to throw out a similar 
variety in the sexual elements at the same time. The changes 
in the germs would everywhere be collateral, although the 
moments when any of the changed germs happen to receive 
their development might be different.” This is the first state- 
ment of the doctrine of Diplogenesis with which I have met 
and it appears to me to furnish the most rational basis for the 
investigation into the dynamics of the process. 
