Much of what became common when evolutionism was accepted can be found inCh.2, Descent of Man
For example,
Quote
Malthus has discussed these several checks, but he does not lay stress enough on what is probably the most important of all, namely infanticide, especially of female infants and the habit of procuring abortion. These practices now prevail in many quarters of the world; and infanticide seems formerly to have prevailed, as Mr. M'Lennan* has shewn on a still more extensive scale. These practices appear to have originated in savages recognising the difficulty, or rather the impossibility of supporting all the infants that are born.
In this single chapter, Darwin explains the benefits of infanticide/abortion eugenics/racism, and at least some forms of Social Darwinism. Not the most pleasant reading - I didn't yet do a thorough job myself.

Ironically, we now live in a much more primitive culture than he did. Ironically, but not surprisingly.

Lamarckism is touched on also. Quite the handy encapsulation.

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson