On this globe, in this fourth round, there was a departure from the straightforward scheme of evolution.

This being the middle globe of a middle round, the midmost point of evolution upon it marked the last moment at which it was possible for members of what had been the lunar animal kingdom to attain individualization.

Consequently a sort of strong effort was made--a special scheme was arranged to give a final chance to as many as possible.

The conditions of the first and second rounds were specially reproduced in place of the first and second races--conditions of which in the earlier rounds these backward egos had not been able fully to take advantage.

Now, with the additional evolution, which they had undergone during the third round, some of them were able to take such advantage, and so they rushed in at the very last moment before the door was shut, and became just human.