. A critique of the theory of evolution. Evolution. THEORY OF EVOLUTION 21 then more probable that the mammal and bird possess this stage in their development simpljr because it has never been lost? Is not this a more reasonable view than to suppose that the gill slits of the embryos of the higher forms represent the adult gill slits of the fish. Fig. 11. Side views of head of embryo sharks, showing gill slits. that in some mysterious way have been pushed back into the embryo of the bird? I could give manj'^ similar examples. All can be interpreted as embrj'^onic survivals rather than as phyle
. A critique of the theory of evolution. Evolution. THEORY OF EVOLUTION 21 then more probable that the mammal and bird possess this stage in their development simpljr because it has never been lost? Is not this a more reasonable view than to suppose that the gill slits of the embryos of the higher forms represent the adult gill slits of the fish. Fig. 11. Side views of head of embryo sharks, showing gill slits. that in some mysterious way have been pushed back into the embryo of the bird? I could give manj'^ similar examples. All can be interpreted as embrj'^onic survivals rather than as phyletic contractions. ISTot one of them calls for the latter interpretation. The study of the cleavage pattern of the segmenting egg furnishes the most convincing evidence that .a different explanation from the one stated in the biogenetic law is the more probable 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 Morgan, Thomas Hunt, 1866-1945. Princeton, Princeton University Press; [etc. , etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectevoluti, bookyear1916
