Note 22 — Chapter XXIV · LAWS OF VARIATION—USE AND DISUSE, ETC.
Reading edition
Nathusius, ‘Die Racen des Schweines,’ 1860, s. 53, 57; ‘Vorstudien . . . Schweineschädel,’ 1864, s. 103, 130, 133. Prof. Lucae supports and extends the conclusions of Von Nathusius: ‘Der Schädel des Maskenschweines,’ 1870.