CHAPTER XIV.
MUTUAL AFFINITIES OF ORGANIC BEINGS: MORPHOLOGY -- EMBRYOLOGY --
RUDIMENTARY ORGANS.
Classification, groups subordinate to groups -- Natural system -- Rules and
difficulties in classification, explained on the theory of descent with
modification -- Classification of varieties -- Descent always used in
classification -- Analogical or adaptive characters -- Affinities, general,
complex and radiating -- Extinction separates and defines groups --
Morphology, between members of the same class, between parts of the same
individual -- Embryology, laws of, explained by variations not supervening
at an early age, and being inherited at a corresponding age -- Rudimentary
Organs; their origin explained -- Summary.
CHAPTER XV.
RECAPITULATION AND CONCLUSION.
Recapitulation of the objections to the theory of Natural Selection --
Recapitulation of the general and special circumstances in its favour --
Causes of the general belief in the immutability of species -- How far the
theory of Natural Selection may be extended -- Effects of its adoption on
the study of Natural history -- Concluding remarks.
GLOSSARY OF SCIENTIFIC TERMS.
INDEX.
ORIGIN OF SPECIES.
INTRODUCTION.
When on board H.M.S. Beagle, as naturalist, I was much struck with certain
facts in the distribution of the organic beings inhabiting South America,
and in the geological relations of the present to the past inhabitants of
that continent.
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