As some species die out, forms better adapted to utilize the obstacles against which they struggled in vain come into being.


The Middle Works, 1899-1924 (ed. SIU Press, 1980) - ISBN: 9780809309337


As some species die out, forms better adapted to utilize the obstacles against which they struggled in vain come into being.

As some species die out, forms better adapted to utilize the obstacles against which they struggled in vain come into being.

As some species die out, forms better adapted to utilize the obstacles against which they struggled in vain come into being.

As some species die out, forms better adapted to utilize the obstacles against which they struggled in vain come into being.