Abstract
PERHAPS the reviewer should have made it plainer that the difficulty he stated at the top of p. 303 is not admitted by those morphologists who have ceased to believe that the germ layers afford any criterion of homology. He simply expressed his conviction, which he shares with many, that it does count for something which layer a structure develops from. He said that he was not prepared to follow Dr. Gaskell in throwing the germ-layer theory overboard, and that this made criticism difficult, a discussion of the author's dismissal of the theory being impossible in an article which appreciation of the book discussed had already expanded far beyond the limits prescribed.
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The Germ-layer Theory. Nature 80, 428 (1909). https://doi.org/10.1038/080428b0
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DOI: https://doi.org/10.1038/080428b0
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