02910cam a22003613u 4500 37221 UtSlPG 20260610133840.0 m cr n 260607r2011||||utu|||||o|||||||||||||| d UtSlPG en iso639-1 QH Hertwig, Oscar, 1849-1922 Präformation oder Epigenese? English The Biological Problem of To-day: Preformation Or Epigenesis? : The Basis of a Theory of Organic Development The Biological Problem of Today: Preformation Or Epigenesis? The Basis of a Theory of Organic Development Salt Lake City, UT : Project Gutenberg, 2011 1 online resource : multiple file formats text txt rdacontent computer c rdamedia online resource cr rdacarrier Release date is 2011-08-27 Produced by Bryan Ness, Josephine Paolucci and the Online Distributed Proofreading Team at http://www.pgdp.net. (This book was produced from scanned images of public domain material from the Google Print project.) "The Biological Problem of To-day: Preformation Or Epigenesis?" by Oscar Hertwig is a scientific treatise written in the late 19th century. This work delves into the biological debate concerning the nature of development, specifically examining two opposing theories: preformation, which posits that all characteristics of an organism are already present in a miniature form within the germ, and epigenesis, which suggests that development is a progressive formation from an initially unorganized state. Hertwig's exploration of these theories is informed by his expertise in embryology and cell biology. The opening of the book sets up the central question regarding whether embryonic development represents a preformed structure or an elaborative process shaped by environmental influences. Hertwig introduces the ideas of other biologists, particularly focusing on August Weismann's germplasm theory, which classifies hereditary material as distinct and stable while addressing the complexities of reproduction and differentiation. Through critical analysis, Hertwig aims to establish that true development relies on epigenesis, where the organism grows and develops through interactions with its surroundings, rather than merely revealing what was predetermined in the germ. The opening serves as a prelude to a deeper examination of the implications each theory carries for understanding heredity and the intricacies of life. (This is an automatically generated summary.) Original publication data not identified Developmental biology Embryology Genetics Mitchell, P. Chalmers, Sir (Peter Chalmers), 1864-1945 https://www.gutenberg.org/ebooks/37221 78061 78061