If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the...
This survival of the fittest implies multiplication of the fittest. { .}
This survival of the fittest which I have here sought to express in mechanical terms, is that which Mr. has called 'natural selection, or the preservation of favoured races in the struggle for life.
