There any man, Monogenist, polygenist, eugenestic or dysgenestic, may state the truth as far as is in him.
"The Life of Sir Richard Burton"
Thomas Wright
These speculations may be grouped under three heads: firstly, the Monogenist hypotheses; secondly, those of the Polygenists; and thirdly, that which would result from a simple application of Darwinian principles to mankind.
"Critiques and Addresses"
Thomas Henry Huxley