Geography and geographical space : towards an epistemology of geography. — More than a comment of H. Isnard's new book on Geographical Space, this article questions the validity of new geographical trends. Is the New Systemic Grid proposed by Isnard useful to reread traditional human geography ? The need for an epistemological base is central to geography; but geographers must not forget that geographic space is first a social product. Totality, hierarchy, différenciation and finality can define a geosystem reflecting the dialectic opposition between space and society.Plus qu'un commentaire de l'ouvrage d'Hildebert Isnard sur L'espace géographique, cet article s'interroge sur la validité des voies empruntées par la nouvelle géographie. La p...