Thomas Huxley at about age 55

Huxley was an English biologist who became known as "Darwin's Bulldog" for his strong advocacy of Charles Darwin's theory of evolution. Huxley is credited with perhaps doing more than anyone else to advance acceptance of the theory among scientists and the general public. In a letter to Charles Darwin on November 23, 1859, regarding the Origin of Species, Huxley wrote:

"I finished your book yesterday. . . Since I read Von Baer's Essays nine years ago no work on Natural History Science I have met with has made so great an impression on me & I do most heartily thank you for the great store of new views you have given me. . . As for your doctrines I am prepared to go to the Stake if requisite. . . . I trust you will not allow yourself to be in any way disgusted or annoyed by the considerable abuse & misrepresentation which unless I greatly mistake is in store for you. . . And as to the curs which will bark and yelp -- you must recollect that some of your friends at any rate are endowed with an amount of combativeness which (though you have often & justly rebuked it) may stand you in good stead -- I am sharpening up my claws and beak in readiness."