Word: sexual
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Dates: during 1880-1889
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Dimorphism was also spoken of, or the difference in coloration of members of the same species, such as early spring, late spring and summer forms. Also sexual dimorphism, or differences in coloration between sexes...
...discern the germ of the nervous system, and later, a keen appreciation of the outer world. But no trace is visible of sympathy, ("the going out of the mind into fields of life beyond it self"), until we reach those animals in which the sexes are distinguished. The sexual and parental instinct is the beginning of sympathy. In the lower forms in which this instinct is distinguished, it is but momentary, and the offspring is self-supporting from the first. As we ascend we see the young more and more helpless, and drawing more and more care from the parent...