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)

Au plan européen, la réflexion sur le rôle de la religion dans la société dite sécularisée ou libérale reste embryonnaire. Toutefois, les trois principes classiques de l’éthique sociale chrétienne se reflètent dans les objectifs de l’Union européenne. L’article rappelle d’abord l’histoire souvent conflictuelle des rapports Église-État en Europe. Il évoque également le débat entre Jürgen Habermas et le Cardinal Joseph Ratzinger, consacré à la pertinence d’une approche de la religion et des principes d’une éthique sociale chrétienne au sein de l’État (...) libéral et sécularisé. Il esquisse enfin quelques conséquences pour un renouveau de la théologie morale. (shrink)