If this is not done, future ages will certainly look back upon us as a people so immersed in the pursuit of wealth as to be blind to higher considerations.

But naturalists are now beginning to look beyond this, and to see that there must be some other principle regulating the infinitely varied forms of animal life.

It has been generally the custom of writers on natural history to take the habits and instincts of animals as the fixed point, and to consider their structure and organization as specially adapted to be in accordance with them.

Modification of form is admitted to be a matter of time

The white men in our colonies are too frequently the savages

Every species has come into existence coincident both in space and time with a pre-existing closely allied species.

Civilisation has ever accompanied emigration and conquest - the conflict of opinion, of religion, or of race