Herbert Spencer Quote
Throughout all organic nature there is at work a modifying influence of the kind... as the cause, these specific differences: an influence which, though slow in its action, does, in time, if the circumstances demand it, produce marked changes—an influence, which to all appearance, would produce in the millions of years, and under the great varieties of condition which geological records imply, any amount of change.
"The Development Hypothesis" (1852)
