Project Gutenberg 2015-01-02 Public domain in the USA. 1118 Weismann, August 1834 1914 Weismann, A. (August) Weismann, Friedrich Leopold August Darwin, Charles 1809 1882 Darwin, Charles Robert Meldola, Raphael 1849 1915 Studien zur Descendenz-Theorie. English Studies in the Theory of Descent (Volumes 1 and 2) 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" by August Weismann is a scientific publication written in the late 19th century. This work delves into the principles of evolution, focusing significantly on the mechanisms of inheritance and variability in species, particularly in insects. It aims to investigate the interactions between environmental factors and biological development, thereby exploring the complexities and implications of evolutionary theory. At the start of this work, Weismann introduces the concept of seasonal dimorphism in butterflies, where different forms of a species appear at different times of the year, as exemplified by the species "Araschnia Levana". He describes experiments that reveal how environmental influences, such as temperature, can affect the development and characteristics of butterflies, offering insights into the origin of their markings. Weismann challenges existing views on adaptation and establishes a basis for further investigation into how species may evolve and adapt over time, highlighting the significance of both inherited traits and external conditions in shaping biological forms. (This is an automatically generated summary.) Reading ease score: 47.2 (College-level). Difficult to read. en Insects Heredity Zoology Butterflies Lepidoptera Insects -- Evolution Mechanism (Philosophy) QH QL Text Category: Science - Biology 1425570 2025-08-19T09:09:06.820351 text/html 1402870 2024-10-24T13:38:57 text/html 1149850 2025-08-19T09:09:27.511262 application/epub+zip 1155266 2025-08-19T09:09:10.860312 application/epub+zip 573099 2025-08-19T09:09:08.828325 application/epub+zip 1551434 2025-08-19T09:09:38.612201 application/x-mobipocket-ebook 1406866 2025-08-19T09:09:25.159279 application/x-mobipocket-ebook 826827 2022-09-21T17:30:41.604571 application/x-mobipocket-ebook 1176881 2025-08-19T09:09:03.830910 text/plain; charset=us-ascii 1156857 2024-10-24T13:38:57 text/plain; charset=us-ascii 19454 2025-08-19T09:09:38.789159 application/rdf+xml 11360 2025-08-19T09:09:09.058319 image/jpeg 2173 2025-08-19T09:09:08.943313 image/jpeg 1012963 2025-08-19T09:09:06.936364 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 de.wikipedia en.wikipedia en.wikipedia