I am decidedly of the opinion that in very many instances we can trace such a necessary connexion, especially among birds, and often with more complete success than in the case which I have here attempted to explain.

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

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

On the spiritual theory, man consists essentially of a spiritual nature or mind intimately associated with a spiritual body or soul, both of which are developed in and by means of a material organism

Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.

In my solitude I have pondered much on the incomprehensible subjects of space, eternity, life and death.

In all works on Natural History, we constantly find details of the marvellous adaptation of animals to their food, their habits, and the localities in which they are found.