MA THEM A TIC A L SCIENCES. 



him the title of Athiilrnhli' Doctor, and he proved himself worthy of it by the 

 general curiosity which animated him, by the ardour which he displayed for 



Fig. 61. A Lesson in Astronomy (Thirteenth Century). Miniature from the Breviary of 

 St. Louis. In the Arsenal Library, Paris. 



the advancement of science, and, above all, by the grandeur and originality 

 of tli<> views expressed by him in his works. He represents more accurately 

 than any one else 1 in the thirteenth century the movement which was already 



