The evolution of man: a popular exposition of the principal points of human ontogeny and phylogene . Fig. 235. Fig. 236. Figs. 232, 233.—Head of an embryonic Chick, on the third day ofincubation: 232, from the front; 233, from the right side, n, Nose-rudi-ment (olfactory grooves); I, eye-rudiment (sight-grooves); g, ear-rudiment(auditory grooves); a;, fore-brain; gl, eye-slits; o, upper jaw process; u,lower jaw process of the first gill arch. Fig. 234.—Head of an embryonic Chick, on the fourth day of incubation,from below: n, nose-groove; o, upper jaw process of the first gill arch;u, lowe
The evolution of man: a popular exposition of the principal points of human ontogeny and phylogene . Fig. 235. Fig. 236. Figs. 232, 233.—Head of an embryonic Chick, on the third day ofincubation: 232, from the front; 233, from the right side, n, Nose-rudi-ment (olfactory grooves); I, eye-rudiment (sight-grooves); g, ear-rudiment(auditory grooves); a;, fore-brain; gl, eye-slits; o, upper jaw process; u,lower jaw process of the first gill arch. Fig. 234.—Head of an embryonic Chick, on the fourth day of incubation,from below: n, nose-groove; o, upper jaw process of the first gill arch;u, lower jaw process of the same ; k, second gill-arch; sp, choroidal fissureof the eye ; s, throat (pharynx). Figs. 235, 236.—Two heads of embryonic Chicks : 235, at the end of thefourth day; 236, at the end of the fifth day of incubation. The letters as inFig. 234. Additional letters are in, inner, and an, outer nasal process; nf,nasal furrow ; st, frontal process ; to, mouth-cavity. (After Koelliker.) All these figures are proportionately enlarged. 244 THE EVOLUTION OF MAN. original separation of
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Keywords: ., bookcentury1800, booksubjectembryologyhu, booksubjecthumanbeings
