Hitherto we had known that an elephant was a long-lived animal and a fly short-lived, but we could give no reason why the one should live longer than the other; that is to say, it did not follow in immediate coherence with, or as intimately associated with, any familiar principle that an animal which is late in the full development of its reproductive system will tend to live longer than one which reproduces early.
"Luck or Cunning?"
Samuel Butler
One of the laws of biology is that every individual, in his development, reproduces the history of the race; so that impulses and mental states of a child reveal to us what our far-off ancestors loved and feared.
"The Book of Life: Vol. I Mind and Body; Vol. II Love and Society"
Upton Sinclair
It is not so much the beauty of form and colour, as the appearance of force and life which he reproduces.
"The Roman Poets of the Republic"
W. Y. Sellar