Why does man regret, even though he may endeavour to banish any such regret, that he has followed the one natural impulse, rather than the other; and why does he further feel that he ought to regret his conduct? Man in this respect differs profoundly from the lower animals.

Now when naturalists observe a close agreement in numerous small details of habits, tastes and dispositions between two or more domestic races, or between nearly-allied natural forms, they use this fact as an argument that all are descended from a common progenitor who was thus endowed; and consequently that all should be classed under the same species. The same argument may be applied with much force to the races of man.

It is scarcely possible to doubt that the love of man has become instinctive in the dog.

A republic cannot succeed, till it contains a certain body of men imbued with the principles of justice and honour.

Man is developed from an ovule, about 125th of an inch in diameter, which differs in no respect from the ovules of other animals.

The explanation of types of structure in classes - as resulting from the will of the Deity, to create animals on certain plans - is no explanation. It has not the character of a physical law and is therefore utterly useless. It foretells nothing because we know nothing of the will of the Deity, how it acts and whether constant or inconstant like that of man.

As for a future life, every man must judge for himself between conflicting vague probabilities.

The main conclusion arrived at in this work, namely that man is descended from some lowly-organised form, will, I regret to think, be highly distasteful to many persons. But there can hardly be a doubt that we are descended from barbarians.

The presence of a body of well-instructed men, who have not to labor for their daily bread, is important to a degree which cannot be overestimated; as all high intellectual work is carried on by them, and on such work material progress of all kinds mainly depends, not to mention other and higher advantages.