Note 1 — Chapter I · THE PATRIARCHAL THEORY
Reading edition
"The expression 'human marriage' will probably be regarded by most people as an improper tautology. But, as we shall see, marriage, in the natural-history sense of the term, does not belong exclusively to our own species. No more fundamental difference between man and other animals should be implied in sociological than in biological and psychological terminology. Arbitrary classifications do science much injury."—Westermarck, History of Human Marriage, 6. In like spirit, Hellwald entitles his book Die menschliche Familie.