Studies in the theory of descent 2
Includes bibliographical references pt. 1. On the seasonal dimorphism of butterflies. pts. 2-3. On the final causes of transformation: 1. The origin of the markings of caterpillars. 2. On phyletic parallelism in metamorphic species. 3. The transformation of the Mexican axolotl into Amblystoma. 4. On the mechanical conception of nature 31
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