RISE OF EVOLUTIONARY THOUGHT 429 
whole inferior to those that survived. In the two hours that 
elapsed before my ague fit was over, I had thought out 
almost the whole of the theory; and the same evening I 
sketched the draught of my paper, and in the two succeeding 
evenings wrote it out in full, and sent it by the next post to 
Mr. Darwin.” 
It thus appears that the announcement of the Darwin- 
Wallace theory of natural selection was made in 1858, and 
in the following year was published the book, the famous 
Origin of Species, upon which Darwin had been working 
when he received Mr. Wallace’s essay. Darwin spoke of this 
work as an outline, a sort of introduction to other works 
that were in the course of preparation. His subsequent 
works upon Animals and Plants under Domestication, The 
Descent of Afan, etc., etc., expanded his theory, hut none of 
them effected so much stir in the intellectual world as the 
Origin of Species. 
This skeleton outline should be filled out by reading 
Darwin’s Lije and Letters, by his son, and the complete 
papers of Darwin and Wallace, as originally published in 
the Journal of the Linnean Society. The original papers 
are reproduced in the Popular Science Monthly for Novem- 
ber, 1901. 
Wallace was born in 1823, and is still living. He shares 
with Darwin the credit of propounding the theory of natural 
selection, and he is notable also for the publication of import- 
ant books, as the Malay Archipelago, The Geographical Distri- 
bution of Animals, The Wonderful Century, etc. 
The Spread of the Doctrine of Organic Evolution. Hux- 
ley.—Darwin was of a quiet habit, not aggressive in the 
defense of his views. His theory provoked so much oppo- 
sition that it needed some defenders of the pugnacious type. 
In England such a man was found in Thomas Henry Huxley 
(1825-1895). He was one of the greatest popular exponents 
