Spengel, disagrees with explanation of man’s hairlessness.
Sperm-whales, battles of male.
Sphingidae, coloration of the.
Sphinx, Humming-bird.
Sphinx, Mr. Bates on the caterpillar of a.
Sphinx moth, musky odour of.
Spiders, parental feeling in; male, more active than female; proportion of the sexes in; secondary sexual characters of; courtship of male; attracted by music; male, small size of.
Spilosoma menthastri, rejected by turkeys.
Spine, alteration of, to suit the erect attitude of man.
Spirits, fondness of monkeys for.