Modification of form is admitted to be a matter of time

What we need are not prohibitory marriage laws, but a reformed society, an educated public opinion which will teach individual duty in these matters

There is a tendency in nature to the continued progression of certain classes of varieties further and further from the original type.

Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly. To expect the world to receive a new truth, or even an old truth, without challenging it, is to look for one of those miracles which do not occur.

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

As well might it be said that, because we are ignorant of the laws by which metals are produced and trees developed, we cannot know anything of the origin of steamships and railways

To say that mind is a product or function of protoplasm, or of its molecular changes, is to use words to which we can attach no clear conception