Страница 24


Письмо №67, стр. 24

globe Z they will not move forward to re-enter A in precedence of man, but under a law of retardation operative from the central point — or earth — to Z and which equilibrates a principle of acceleration in the descending arc — they will have just finished their respective evolution of genera and species, when man reaches his highest development on globe Z — in this or any round. The reason for it is found in the enormously greater time required by them to develop their infinite varieties as compared with man; the relative speed of development in the rings therefore naturally increases as we go up the scale from the mineral. But these different rates are so adjusted by