I have no desire to write my own biography, as long as I have strength and means to do better work.

To those who have chosen the profession of medicine, a knowledge of chemistry, and of some branches of natural history, and, indeed, of several other departments of science, affords useful assistance.

Telegraphs are machines for conveying information over extensive lines with great rapidity.

Whenever a man can get hold of numbers, they are invaluable: if correct, they assist in informing his own mind, but they are still more useful in deluding the minds of others. Numbers are the masters of the weak, but the slaves of the strong.

It can happen to but few philosophers, and but at distant intervals, to snatch a science, like Dalton, from the chaos of indefinite combination, and binding it in the chains of number, to exalt it to rank amongst the exact. Triumphs like these are necessarily 'few and far between.'

The errors which arise from the absence of facts are far more numerous and more durable than those which result from unsound reasoning respecting true data.

You will be able to appreciate the influence of such an Engine on the future progress of science. I live in a country which is incapable of estimating it.