The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . 4- 5 Fig. 273.—Skeleton of hand or fore-foot of six Mammals. I. Man; ; III. Pig; IV. Ox; V. Tapir; VI. Horse, r, Eadius; u, ulna;a, scaphoid; h, semi-lunar; c, triquetrum (cuneiform); d, trapezium; gytrapezoid ; /, capitatnm (unciform process) ; g, hamatum (unciform bone) Jp, pisiform; 1, thumb; 2, digit; 3, middle finger; 4, ring finger; 5, littlefinger. (After Gegenbaur.) ORIGIN OF THE LIMBS. 307 Tol. i. p. 362; / fore-leg, b, hinrl-leg.) In all, the firs
The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . 4- 5 Fig. 273.—Skeleton of hand or fore-foot of six Mammals. I. Man; ; III. Pig; IV. Ox; V. Tapir; VI. Horse, r, Eadius; u, ulna;a, scaphoid; h, semi-lunar; c, triquetrum (cuneiform); d, trapezium; gytrapezoid ; /, capitatnm (unciform process) ; g, hamatum (unciform bone) Jp, pisiform; 1, thumb; 2, digit; 3, middle finger; 4, ring finger; 5, littlefinger. (After Gegenbaur.) ORIGIN OF THE LIMBS. 307 Tol. i. p. 362; / fore-leg, b, hinrl-leg.) In all, the first rudi-ment of each limb in the embryo is a simple wart, or smallknob, which grows from the side of the body between thedorsal and ventral sides (Figs. 119 and 120, vol. i. pp. 357, 3o9;136 and 137, pp. 381, 382). The cells composing these knobsbelono- to the skin-fibrous layer. The outer surface is coatedb}^ the horn-plate, which is rather thicker at the apex ofthe protuberance (Plate IV. Fig. o, x). The two anteriorprotuberances appear at a rather earlier period than thetwo posterior. By differentiation of the cells, these
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