. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Fig. 117. Fig. 118. Fig. 119. each other until they unite and form a canal, ^Fig. 117, b,) DLVELOPMENT OF THE YOUNG WITHIN THE EGG. 147 as has been before shown, (Fig. 107.) At the same /me,an enlargement at one end of the furrow is observed. Thisis the rudiment of the head, (Fig. 118,) in which may soonbe distinguished traces of the three divisions of
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Fig. 117. Fig. 118. Fig. 119. each other until they unite and form a canal, ^Fig. 117, b,) DLVELOPMENT OF THE YOUNG WITHIN THE EGG. 147 as has been before shown, (Fig. 107.) At the same /me,an enlargement at one end of the furrow is observed. Thisis the rudiment of the head, (Fig. 118,) in which may soonbe distinguished traces of the three divisions of the brain,(Fig. 119,) corresponding to the senses of sight, (m,) hear-ing, (e,) and smell, (p.) 310. Towards the thirteenth day, we see a transparent,cartilaginous cord, in the place afterwards occupied by theback-bone, composed of large cells, on which transverse
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectp, booksubjectzoology
