From the remotest nebul? and from the revolving double stars, we have descended to the minutest organisms of animal creation, whether manifested in the depths of ocean or on the surface of our globe, and to the delicate vegetable germs which clothe the naked declivity of the ice-crowned mountain summit; and here we have been able to arrange these phenomena according to partially known laws; but other laws of a more mysterious nature rule the higher spheres of the organic world, in which is comprised the human species in all its varied conformation, its creative intellectual power, and the languages to which it has given existence. A physical delineation of nature terminates at the point where the sphere of intellect begins, and a new world of mind is opened to our view. It marks the limit, but does not pass it.

While we maintain the unity of the human species, we at the same time repel the depressing assumption of superior and inferior races of men. There are nations …

Cruelty to animals is one of the most significant vices of a low and ignoble people. Wherever one notices them, they constitute a sure sign of ignorance and br…

The principal impulse by which I was directed was the earnest endeavor to comprehend the phenomena of physical objects in their general connection, and to repr…

Ergo vivida vis pervicet et extra processit longe flamentia moenia mundi atque omne immensum peragravit mente animoque.

Physics has in the main contented itself with studying the abridged edition of the book of nature.

I feel most deeply that this whole question of Creation is too profound for human intellect. A dog might as well speculate on the mind of Newton! Let each man …