Natural Selection ~ Charles Darwin
“I am fully convinced that species are not immutable... Furthermore, I am
convinced that Natural Selection has been the main but not exclusive means of modification.
Quotations about Natural Selection
To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree. When it was first said that the sun stood still and the world turned round, the common sense of mankind declared the doctrine false; but the old saying of Vox populi, vox Dei, as every philosopher knows, cannot be trusted in science. Reason tells me, that if numerous gradations from a simple and imperfect eye to one complex and perfect can be shown to exist, each grade being useful to its possessor, as is certainly the case; if further, the eye ever varies and the variations be inherited, as is likewise certainly the case and if such variations should be useful to any animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, should not be considered as subversive of the theory.
I have called the principle, by which each slight variation, if useful, is preserved by the term of Natural Selection. The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate and is sometimes equally convenient.
There are many entertaining and instructive quotations about, or attributable to, Charles Darwin:-
For instance as a boy of sixteen his father said to him:-
"You care for nothing but shooting, dogs and rat-catching, and you will be a disgrace to yourself and all your family."Darwin was keenly interested in Natural History as a young man and his Autobiography mentions one particular beetle hunt in detail:-
"I will give a proof of my zeal: one day on tearing off some old bark, I saw two rare beetles and seized one in each hand; then I saw a third and new kind, which I could not bear to lose, so that I popped the one which I held in my right hand into my mouth. Alas it ejected some intensely acrid fluid, which burnt my tongue so that I was forced to spit the beetle out, which was lost, as well as the third one".
Our own favourite Darwin quote is, however, a very significant one which is to be found in a confidential letter of 11 January 1844 to a fellow scientist named Joseph Hooker.
In this letter Darwin, speaking about how he had spent his time after his voyaging on HMS Beagle, wrote that:-
"I have been now ever since my return engaged in a very presumptuous work & which I know no one individual who wd not say a very foolish one.— I was so struck with distribution of Galapagos organisms &c &c & with the character of the American fossil mammifers, &c &c that I determined to collect blindly every sort of fact, which cd bear any way on what are species.— I have read heaps of agricultural & horticultural books, & have never ceased collecting facts— At last gleams of light have come, & I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable. Heaven forfend me from Lamarck nonsense of a “tendency to progression” “adaptations from the slow willing of animals” &c,—but the conclusions I am led to are not widely different from his—though the means of change are wholly so— I think I have found out (here's presumption!) the simple way by which species become exquisitely adapted to various ends.— You will now groan, & think to yourself ‘on what a man have I been wasting my time in writing to.’— I shd, five years ago, have thought so.— "