In like manner it is necessary that the natural philosopher should know concerning place, as well as concerning the infinite, whether it is or not, and in what manner it is, and what it is: for all men conceive that beings are somewhere; since non-being is nowhere: for where is a herco-cervus, or a sphinx? And that which is the most common and principle motion, which we call lation, subsists according to place. What place is, however, is attended with many doubts, for it does not appear to be the same to those who survey it from all its inherent properties. Beside, we have nothing transmitted to us by other philosophers, either as a doubt about place, or an explanation of its nature.