Heredity and sex . Fig. 52. — Four species of beetles in which the male (to the left) has hornswhich are absent in the female (to the right). (After Darwin.) not found at all in plants; or rather, if character-istic differences exist in plants, they are not called bythis name — for plants cannot see or move and there-fore cannot court each other. 106 HEREDITY AND SEX In fact, sight in the sense of forming visual picturescan occur only when eyes are well developed. This.

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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913