As a master of Arts at the University of Bologna in the second half of XIVth Century, Simon of Castello decided to pour what he learned at the University of Paris into updating the university education and training. His project is clearly delineated in the opening words (a sort of prologue) to his two works : De proporcionibus velocitatum in motibus (edited by J. McCue in 1961) and the unpublished Questiuncule decem, introduced as a comment to De (...) class='Hi'>proportionibus. The three last of these Questiuncule are edited here with a brief introduction. They have been selected for their referring to latitudines; explicit quotations from Burley’s works on latitudes (Tractatus primus and secundus) speaks to the early diffusion of the English master in the Italian university education. Simon expresses his gratitude toward Henry of Langenstein, his master in Paris. (shrink)