[55] Letourneau, Evolution of Marriage, p. 327.
[56] In this connection see The Truth about Woman pp. 110-111.
[57] Darwin, Descent of Man, p. 443.
[58] Espinas, Soc. Animales. See the introductory and concluding chapters of this admirable book.
[59] Havelock Ellis, Psychology of Sex, vol. vi. p. 422.
[60] J. C. Houtzeau, Facultés mentales des animaux, vol. ii. p. 394. This work should be consulted, in particular, for the comparison it gives of the mental faculties of the animals with those of man.
[61] Darwin, Descent of Man, p. 399.
[62] Letourneau, Evolution of Marriage, p. 33. See also The Truth about Woman, p. 109 and The Position of Woman in Primitive Society.
[63] Mitchell, Childhood of Animals, p. 171 et seq.; p. 176.
[64] English title, The Position of Woman in Primitive Society: A Study of Matriarchy.