ABSTRACT
The Franciscans and Dominicans continued to practise their natural philosophy through the thirteenth century as long as they thought there was need for spiritual and learned guidance. Meanwhile, the regent masters of the universities, who had been familiar with the sources of the friars' philosophy before the friars came into existence, also constructed a natural philosophy. This proved to be remarkably long lived and survived inside the universities down to the middle of the seventeenth century. While the natural philosophies of the two Orders of friars never came close to each other, the secular masters and their students handled a constructed natural philosophy that contained elements of both. The story of the masters' natural philosophy is one for another book and we can note here only that, like the philosophy of the friars, it was called into existence for specific historical reasons.
