. Human physiology : designed for colleges and the higher classes in schools, and for general reading. has gills, which are loose fringes on each side of the gills after a time disappear, and it has another set ofgills arranged under a fold of skin very much like the gills of afish. The form is then as in Fig. 50. The next change isthis. The hind legs begin to grow out as seen in Fig. , the fore legs appear as seen in Fig. 52. The tail is stillvery large. This now gradually disappears while the legs growas represented in Fig. 53. In Fig. 54, representing the perfectfrog, the
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. has gills, which are loose fringes on each side of the gills after a time disappear, and it has another set ofgills arranged under a fold of skin very much like the gills of afish. The form is then as in Fig. 50. The next change isthis. The hind legs begin to grow out as seen in Fig. , the fore legs appear as seen in Fig. 52. The tail is stillvery large. This now gradually disappears while the legs growas represented in Fig. 53. In Fig. 54, representing the perfectfrog, the tail has entirely disappeared. With these exteriorchanges interior ones have been going on also. The animal,which was at the first a real fish, breathing with gillsand swimming in water, has lost its gills, and has now a pairof lungs ; and it is no longer able to remain long under water,without coming to the surface to breathe the air. 168. The other example is the silk-worm. It is representedin Fig. 55. When it has attained its full growth, it passes intowhat is termed its chrysalis state, Fig. 5
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