Note 398 — Chapter III · THEORY OF THE ORIGINAL PAIRING OR MONOGAMOUS FAMILY

Consult the very interesting chapter of Westermarck on "Selection as Influenced by Affection and Sympathy, and by Calculation," op. cit., 356 ff. "Affection depends in a very high degree upon sympathy. Though distinct aptitudes, these two classes of emotions are most intimately connected: affection is strengthened by sympathy, and sympathy is strengthened by affection.... If love is excited by contrast, it is so only within certain limits. The contrast must not be so great as to exclude sympathy."—Ibid., 362. "Civilization," he adds, "has narrowed the inner limit, within which a man or woman must not marry;" while "it has widened the outer limit within which a man or woman may marry and generally marries. The latter of these processes has been one of vast importance in man's history."—Ibid., 376.