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The voyage of the Beagle
The book is a vivid travel memoir as well as a detailed scientific field journal covering biology, geology, and anthropology that demonstrates Darwin's keen powers of observation, written at a time when Western Europeans were exploring and charting the whole world. Although Darwin revisited some areas during the expedition, for clarity the chapters of the book are ordered by reference to places and locations rather than by date.
second voyage of HMS Beagle -
The origin of spices
Every species is fertile enough that if all offspring survived to reproduce. Despite periodic fluctuations, populations remain roughly the same size. Resources such as food are limited and are relatively stable over time. Much of this variation is heritable. Individuals less suited to the environment are less likely to survive and reproduce. it slowly affected process results in populations change. Desmond & Moore 1991 p. 477 -
Descent of man/Sexual selection
Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex. ref. The Descent of Man and Selection in Relation to Sex (1871).
