We abolish many things, good and evil, wisely and foolishly, in these fast-going times; but, happily for us, we cannot abolish the blue sky, and the green sea, and the white foam, and the everlasting hills, and the rivers which flow out of their bosoms. They will abolish themselves when their work is done, but not before. And we, who, with all our boasted scientific mastery over Nature, are, from a merely mechanical and carnal point of view, no more than a race of minute parasitic animals burrowing in the fair Earth's skin, had better, instead of boasting of our empire over Nature, take care lest we become too troublesome to Nature, by creating, in our haste and greed, too many great black countries, and too many great dirty warrens of houses, miscalled cities, peopled with savages and imps of our own mis-creation; in which case Nature, so far from allowing us to abolish her, will by her inexorable laws abolish us.

MS. Presidential Address. 1871.