CHAPTER XVII. SECONDARY SEXUAL CHARACTERS OF MAMMALS.
CHAPTER XVIII. SECONDARY SEXUAL CHARACTERS OF MAMMALS, continued.
PART III. SEXUAL SELECTION IN RELATION TO MAN, AND CONCLUSION.
CHAPTER XIX. SECONDARY SEXUAL CHARACTERS OF MAN.
CHAPTER XX. SECONDARY SEXUAL CHARACTERS OF MAN, continued.
CHAPTER XXI. GENERAL A SUMMARY AND CONCLUSION.
PREFACE TO THE SECOND EDITION.
During the successive reprints of the first edition of this work,
published in 1871, I was able to introduce several important
corrections; and now that more time has elapsed, I have endeavoured to
profit by the fiery ordeal through which the book has passed, and have
taken advantage of all the criticisms which seem to me sound. I am also
greatly indebted to a large number of correspondents for the
communication of a surprising number of new facts and remarks. These
have been so numerous, that I have been able to use only the more
important ones; and of these, as well as of the more important
corrections, I will append a list. Some new illustrations have been
introduced, and four of the old drawings have been replaced by better
ones, done from life by Mr. T.W. Wood. I must especially call attention
to some observations which I owe to the kindness of Prof. Huxley (given
as a supplement at the end of Part I.), on the nature of the
differences between the brains of man and the higher apes. I have been
particularly glad to give these observations, because during the last
few years several memoirs on the subject have appeared on the
Continent, and their importance has been, in some cases, greatly
exaggerated by popular writers.
I may take this opportunity of remarking that my critics frequently
assume that I attribute all changes of corporeal structure and mental
power exclusively to the natural selection of such variations as are
often called spontaneous; whereas, even in the first edition of the
Origin of Species, I distinctly stated that great weight must be
attributed to the inherited effects of use and disuse, with respect
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