One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die.
There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone circling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Judging from the past, we may safely infer that not one living species will transmit its unaltered likeness to a distant futurity.
I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection, in order to mark its relation to man’s power of selection.
Great is the power of steady misrepresentation; but the history of science shows that fortunately this power does not long endure.
As natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress towards perfection.
A grain in the balance will determine which individual shall live and which shall die, – which variety or species shall increase in number, and which shall decrease, or finally become extinct.