Darwin and His Great Discovery
Encyclopedia
Darwin and His Great Discovery is a science book
Science book
A science book is a work of nonfiction, usually written by a scientist, researcher, or professor like Stephen Hawking , or sometimes by a non-scientist such as Bill Bryson...

 by L. Sprague de Camp
L. Sprague de Camp
Lyon Sprague de Camp was an American author of science fiction and fantasy books, non-fiction and biography. In a writing career spanning 60 years, he wrote over 100 books, including novels and notable works of non-fiction, including biographies of other important fantasy authors...

 and Catherine Crook de Camp
Catherine Crook de Camp
Catherine Crook de Camp, was an American science fiction and fantasy author and editor. Most of whose work was done in collaboration with her husband L. Sprague de Camp, to whom she was married for sixty years. Her solo work was largely non-fiction.-Life:Catherine Crook was born Catherine Adelaide...

, first published by Macmillan
Macmillan Publishers
Macmillan Publishers Ltd, also known as The Macmillan Group, is a privately held international publishing company owned by Georg von Holtzbrinck Publishing Group. It has offices in 41 countries worldwide and operates in more than thirty others.-History:...

 in 1972.

The work is an examination of naturalist
Natural history
Natural history is the scientific research of plants or animals, leaning more towards observational rather than experimental methods of study, and encompasses more research published in magazines than in academic journals. Grouped among the natural sciences, natural history is the systematic study...

 Charles Darwin
Charles Darwin
Charles Robert Darwin FRS was an English naturalist. He established that all species of life have descended over time from common ancestry, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection.He published his theory...

 and the theory
Theory
The English word theory was derived from a technical term in Ancient Greek philosophy. The word theoria, , meant "a looking at, viewing, beholding", and referring to contemplation or speculation, as opposed to action...

 of evolution
Evolution
Evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.Life on Earth...

 he proposed and marshalled evidence for in The Origin of Species
The Origin of Species
Charles Darwin's On the Origin of Species, published on 24 November 1859, is a work of scientific literature which is considered to be the foundation of evolutionary biology. Its full title was On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the...

.
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