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Updated: June 29, 2025
The sex-difference in organisms, the “abhorrence of self-fertilization” which Mr. Darwin speaks of as so conspicuous and inexplicable a phenomenon, is but one example of the sway of a law which as action and reaction, thesis and antithesis, is common to both elementary motion and thought. The fertile and profound fancy of Greece delighted to prefigure this truth in significant symbols and myths.
Geddes and Thomson and others have maintained that the sex-difference is one of metabolism, the ovum being more anabolic, the sperm more katabolic. A double quantity of special chromatin may be the cause of the greater anabolism of the ovum.
The nucleus, and especially the chromosomes, are supposed in some unknown way to influence or govern the metabolism of the cytoplasm. From this point of view the hypothesis mentioned above that the sex-difference in the gametes is not qualitative but quantitative is probably nearer to the truth.
Wilson, T. H. Morgan, and Richard Hartwig have therefore suggested that the sex-difference as regards gametes is not a qualitative but a quantitative one. In certain cases there is no evident quantitative difference of chromatin as a whole, but there may in all cases be a difference in the quantity of special sex-chromatin contained in the X element.
It has no interest in such human matters. But deprive it of the fact of Sex-difference, and it drifts away whimpering like a dead leaf, an empty husk, a wisp of chaff, a skeleton gossamer. The poor, actual, warm lips, "so sweetly forsworn," may have had small interest for this "spiritual" lover, but now that she is dead and buried, and a ghost, they must remain a woman's lips forever!
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