In 1970, I published in Mélanges de l'Institut Dominicain d'Etudes Orientales (MIDEO) a long article entitled ‘La civilisation musulmane dans l'æuvre du Professeur von Grunebaum’ which was part of a study in preparation for publication. This study although sympathetic was a very objective approach to the works of Gustave E. von Grunebaum. He appreciated it but urged me to make a personal critical evaluation of his work, without hesitating, if necessary, to contradict any of his opinions. As a close friend, I accepted willingly.I composed it under the form of 'some questions posited to M. Grunebaum'. He read my essay and found the questions provocative andinteresting enough to answer. But alas, death snatched him before the essay was published. As tribute to his memory and as a historical document I thought it would be interesting to publish it as is, without any recasting.