. Degeneration : a chapter in Darwinism. Degeneration; Evolution. 22 DEGESERA TION. here and there in these histories of growth from the ^g^ most valuable assistance in the attempt to recon- struct the genealogical tree. The history of the. Fig. 2.âTadpoles and young of the Common Frog, i, Recently hatched (twice natural size) ; 2 and â za, same enlarged to show the external gills ; 3 and 4, later stages with gill slits covered by a membrane leaving only the spiracle (see Fig. t6) as an exit for the respired water ; 5, with hind legs appearing ; 6, with both fore and hind legs ; 7, atrophy of
. Degeneration : a chapter in Darwinism. Degeneration; Evolution. 22 DEGESERA TION. here and there in these histories of growth from the ^g^ most valuable assistance in the attempt to recon- struct the genealogical tree. The history of the. Fig. 2.âTadpoles and young of the Common Frog, i, Recently hatched (twice natural size) ; 2 and â za, same enlarged to show the external gills ; 3 and 4, later stages with gill slits covered by a membrane leaving only the spiracle (see Fig. t6) as an exit for the respired water ; 5, with hind legs appearing ; 6, with both fore and hind legs ; 7, atrophy of the tail; 8, young frog. development of the common frog is a good illustia- tion of the kind of evidence in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London : Macmillan and Co.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonmacmillanand
