The species concept is one of the oldest and most fundamental in biology. And yet it is almost universally conceded that no satisfactory definition of what constitutes a species has ever been proposed. The present article is devoted to an attempt to review the status of the problem from a methodological point of view. Since the species is one of the many taxonomic categories, the question of the nature of these categories in general needs to be entered into.

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our (...) continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. (shrink)

Arabic scholarship and literature flourished during the Mamlūk period, and scholars and students from across the Muslim world were drawn to Cairo and Damascus. This led to opportunities for travel, education, and employment, yet these opportunities were available almost exclusively to men. In Syria and Egypt, and most of the medieval world, women’s involvement in travel, education, and public life, was often restricted. However, there were exceptions, including the prolific writer and poet ʿĀʾisha al-Bāʿūniyya (d. 1517). As a woman, she (...) crossed a number of social and cultural borders in order to enter into the domain of religious scholarship and literary production. Drawing from historical and biographical sources, and especially from ʿĀʾisha al-Bāʿūniyya’s writings, I examine her social and intellectual background, her travels and scholarly interactions in order to highlight some of the social trends and intellectual forces at work in the late Mamlūk period. (shrink)

Dans la foulée des débats de bioéthique en France, l'Ecole Supérieure d'Ethique des Sciences de l'Institut catholique de Toulouse a organisé cinq grands débats éthiques en 2010-2011, en partenariat avec le monde industriel et universitaire, et qui sont ici rapportés. Le livre reprend les interventions des conférenciers et intervenants, présente de manière synthétique et pédagogique les débats qui ont suivi. et en propose une relecture. Cette dernière est faite en termes de défis que l'ensemble de la société est invité à (...) relever pour que les sciences et les techniques soient vraiment au service d'une société toujours plus humaine. Le livre souligne également l'impact des sciences et techniques sur les mentalités de nos contemporains et sur la manière de considérer la place de l'homme et le respect de la vie humaine. (shrink)