Note 32 — Chapter XXXIV · THE ORIGIN AND DEVELOPMENT OF THE ALTRUISTIC SENTIMENT
Reading edition
Savage, ‘Observations on the External Characters and Habits of the Troglodytes Niger, in Boston Journal of Natural History, iv. 384. Cf. von Koppenfels, ‘Meine Jagden auf Gorillas,’ in Die Gartenlaube, 1877, p. 419.