Note 407 — Chapter III · THEORY OF THE ORIGINAL PAIRING OR MONOGAMOUS FAMILY
Reading edition
Spencer, Principles of Sociology, I, 673-75, 678, 679. Insufficient food-supply may cause polygynic and monogamic families to die out; and it is favorable to the survival of the polyandrous family. But the infertility of polyandrous families is unfavorable to their survival, for there are fewer members available for defense.—Ibid., 681.