[45] J. G. Millais, Natural History of British Ducks, p. 8.
[46] The habits of the penguins were first noted by the late Dr. Ed. A. Wilson, the distinguished naturalist of the Discovery Expedition, and on his death his work was ably carried on by the Staff Surgeon, Murray Levick. He has come nearer to the life of the penguin than any other discoverer. See Natural History of the Adélie Penguins. Also article in The New Statesman, April 17, 1915.
[47] The lowliest living mammals, the duck-billed mole and the anteater of Australia, still lay eggs, which they retain within their bodies until nearly ready to hatch.
[48] This case is recorded by Mr. Chalmers Mitchell in The Childhood of Animals, the fascinating book from which I have gained so much assistance.
[49] See The Truth about Woman, pp. 102-114, also The Position of Woman in Primitive Society, the theme of which book follows and develops this theory.
[50] Mitchell, Childhood of Animals, p. 225.
[51] Mitchell, Childhood of Animals, pp. 164, 166, 225.
[52] Letourneau, The Evolution of Marriage, p. 32.
[53] Mitchell, Childhood of Animals, pp. 170-171.
[54] Espinas, Soc. Animales, pp. 120 et seq. The reader should consult this work on the three stages of domestic societies: “the society conjugal, the society maternal, and the society paternal.”