Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. Paged continuously; v. 1: xxxvi, 400; v. 2: 1 p. l., 401-729, [1] p pt. 1. On the seasonal dimorphism of butterflies.--pt. 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 axolati into A̲m̲b̲l̲y̲s̲t̲o̲m̲a̲. 4. On the mechanical conception of nature Translation of Studien zur Descendenz-Theorie
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