In discussing fundamentals of general-relativistic irreversible continuum thermodynamics, this theory is shown to be characterized by the feature that no thermodynamical degrees of freedom are ascribed to gravitation. However, accepting that black hole thermodynamics seems to oppose this harmlessness of gravitation one is called on to consider other approaches. Therefore, in brief some gravitational and thermodynamical alternatives are reviewed.

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.

Présentation d'un manuscrit du IXe siècle, le Codex Athous, Panteleemon 288, qui contient une collection de 34 homélies ainsi que l'oraison funèbre de l'empereur Léon VI . Au début du manuscrit, on trouve un court poème faisant l'éloge de Léon VI en tant qu'homiliste.