I will give up my belief in evolution if someone finds a fossil rabbit in the Precambrian.

Capitalism, though it may not always give the scientific worker a living wage, will always protect him, as being one of the geese which produce golden eggs for its table.

To the biologist the problem of socialism appears largely as a problem of size.

The conclusion forced upon me in the course of a life devoted to natural science is that the universe as it is assumed to be in physical science is only an idealized world, while the real universe is the spiritual universe in which spiritual values count for everything.

Money can buy a fine dog but it is kindness that makes him wag his tail.

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

The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression "Vital force".