Secondary Sexual Characters of Mammals - continued

Now, what must we conclude with respect to such sexual differences as these? No one will pretend that the beards of certain male goats, or

Fig. 68. Pithecia satanas, male (from Brehm).

,6 See Dr Gray's Cat. of Mammalia in British Museum, part iii, 1852, p. 144. '7 Rengger, Siiugethiere, etc., p. 14; Desmarest, Mammalogie, p. 66.