Heredity and sex . election with whichwe started it may be said that Competition and Courtshipstand for the two ways in which Darwin supposesthe secondary sexual characters to have arisen. Competition amongst the males is only a form of nat-ural selection, as Darwin himself recognized (if we leaveout of account the further assumption that the victorchooses his spoils). We may dismiss this side of theproblem as belonging to the larger field of natural selec-tion, and give our attention mainly to those secondarysexual characters that Darwin supposes to have arisenby the female choosing the more
Heredity and sex . election with whichwe started it may be said that Competition and Courtshipstand for the two ways in which Darwin supposesthe secondary sexual characters to have arisen. Competition amongst the males is only a form of nat-ural selection, as Darwin himself recognized (if we leaveout of account the further assumption that the victorchooses his spoils). We may dismiss this side of theproblem as belonging to the larger field of natural selec-tion, and give our attention mainly to those secondarysexual characters that Darwin supposes to have arisenby the female choosing the more ornamented suitor. I shall first bring forward some of the more strikingexamples of secondary sexual characters in the animalkingdom. These characters are confined almost ex-clusively to three great groups of animals — Insects, SECONDARY SEXUAL CHARACTERS 105 Spiders, and Vertebrates. There are a few scatteredinstances found in other groups, but they are the lowest groups they are entirely absent, and are.
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
