Shelley and Keats were the last English poets who were at all up to date in their chemical knowledge.

We do not know, in most cases, how far social failure and success are due to heredity, and how far to environment. But environment is the easier of the two to improve.

The advance of scientific knowledge does not seem to make either our universe or our inner life in it any less mysterious.

A discussion between Haldane and a friend began to take a predictable turn. The friend said with a sigh, 'It's no use going on. I know what you will say next, and I know what you will do next.' The distinguished scientist promptly sat down on the floor, turned two back somersaults, and returned to his seat. 'There,' he said with a smile. 'That's to prove that you're not always right.'

If human beings could be propagated by cutting, like apple trees, aristocracy would be biologically sound.

I think, however, that so long as our present economic and national systems continue, scientific research has little to fear.

An attempt to study the evolution of living organisms without reference to cytology would be as futile as an account of stellar evolution which ignored spectroscopy.