 A new hypothesis on the real author of the Rasâ’il has been formulated in Guillaume de Vaulx d’Arcy’s doctoral dissertation. The author tries to demonstrate that Ahmad b. al-Tayyib al-Sarakhsî, a pupil of al-Kindî, composed the whole encyclopedia in about 894 in the form in which we read it now (de Vaulx d’Arcy 2016, partially reelaborated in de Vaulx d’Arcy 2019a [non vidi]).