The Indian elephant is said sometimes to weep.
I love fools' experiments. I am always making them.
A man's friendships are one of the best measures of his worth.
Man tends to increase at a greater rate than his means of subsistence.
The very essence of instinct is that it's followed independently of reason.
Animals, whom we have made our slaves, we do not like to consider our equal.
How paramount the future is to the present when one is surrounded by children.
A scientific man ought to have no wishes, no affections, -- a mere heart of stone.
It is a cursed evil to any man to become as absorbed in any subject as I am in mine.
I am turned into a sort of machine for observing facts and grinding out conclusions.