Project Gutenberg 2015-01-02 Public domain in the USA. 196 Weismann, August 1834 1914 Weismann, A. (August) Weismann, Friedrich Leopold August Darwin, Charles 1809 1882 Darwin, Charles Robert Meldola, Raphael 1849 1915 Studies in the Theory of Descent, Volume I Produced by Marilynda Fraser-Cunliffe, Charlie Howard, and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) "Studies in the Theory of Descent, Volume I" by August Weismann is a scientific publication written in the late 19th century. This work extensively explores the principles of evolution, specifically focusing on the origins and significance of seasonal dimorphism in butterflies and how variations in external conditions influence these phenomena. The content provides insights into Weismann's theories on inheritance, variation, and the impact of climate on species adaptation. The opening of this volume introduces the concept of seasonal dimorphism, exemplified by the butterfly species "Araschnia Levana", which appears in distinct winter and summer forms. Weismann discusses his experimental findings that suggest these variations are not merely superficial but are influenced by direct external conditions such as temperature and the duration of the developmental stages. He details a series of experiments and observations aimed at understanding whether these differences arise from adaptation via natural selection or from underlying biological processes, ultimately leading toward a deeper investigation of the mechanisms behind evolutionary change. (This is an automatically generated summary.) Reading ease score: 56.1 (10th to 12th grade). Somewhat difficult to read. en Insects Heredity Zoology Butterflies Lepidoptera Insects -- Evolution Mechanism (Philosophy) QH QL Text Category: Science - Biology 816768 2025-07-19T08:57:33.692825 text/html 794342 2024-10-24T13:38:46 text/html 523168 2025-07-19T08:57:45.160677 application/epub+zip 526272 2025-07-19T08:57:35.854751 application/epub+zip 356559 2025-07-19T08:57:34.672756 application/epub+zip 751544 2025-07-19T08:57:51.526649 application/x-mobipocket-ebook 670088 2025-07-19T08:57:44.086668 application/x-mobipocket-ebook 500909 2022-09-21T17:29:31.125978 application/x-mobipocket-ebook 669191 2025-07-19T08:57:32.195791 text/plain; charset=us-ascii 649198 2024-10-24T13:38:46 text/plain; charset=us-ascii 20210 2025-07-19T08:57:51.685687 application/rdf+xml 11052 2025-07-19T08:57:34.849740 image/jpeg 2140 2025-07-19T08:57:34.762754 image/jpeg 448411 2025-07-19T08:57:33.754739 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia en.wikipedia de.wikipedia en.wikipedia