This needs to be done at the beginning of the first round in a new chain, but never after that; for though the life-wave is centred only upon one of the seven globes of a chain at any given time, yet life has not entirely departed from the other globes.

At the present moment, for example, the life-wave of our chain is centred on this Earth, but on the other two physical globes of our chain, Mars and Mercury, life still exists.

There is still a population, human, animal and vegetable, and consequently when the life-wave goes round again to either of those planets there will be no necessity for the creation of new forms.

The old types are already there, and all that will happen will be a sudden marvellous fecundity, so that the various kingdoms will quickly increase and multiply, and make a rapidly increasing population instead of a stationary one.
It was, then, the animal-men, the lowest class of human beings of the Moon-chain, who established the forms in the first round of the Earth-chain.

Pressing closely after them were the highest of the lunar animal kingdom, who were soon ready to occupy the forms which had just been made.