Heredity and sex . Fig. 67. — Merino; male (horned) and female (hornless). If the operation is performed at the time when theantlers have already begun to develop, incompletedevelopment takes place. The antlers remain coveredby the velvet and are never thrown off. They are calledperuke antlers. If the adult stag is castrated whenthe horns are fully developed, they are precociously 134 HEREDITY AND SEX dropped, and are replaced, if at all, by imperfect ant-lers, and these are never renewed. These facts make it clear that there is an intimaterelation between the orderly sequence of developmentof
Heredity and sex . Fig. 67. — Merino; male (horned) and female (hornless). If the operation is performed at the time when theantlers have already begun to develop, incompletedevelopment takes place. The antlers remain coveredby the velvet and are never thrown off. They are calledperuke antlers. If the adult stag is castrated whenthe horns are fully developed, they are precociously 134 HEREDITY AND SEX dropped, and are replaced, if at all, by imperfect ant-lers, and these are never renewed. These facts make it clear that there is an intimaterelation between the orderly sequence of developmentof the horns in the deer and the presence of the malesexual glands. In the case of sheep, the evidence is more we have carefully planned experiments in whichboth sexes have been studied; and there are breeding.
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
