ABSTRACT
This chapter examines the view that although individual things, particulars, tokens, fall naturally into all sorts of classes and thus may be said to be of this or that type, this fact cannot be analyzed further. One thing that the natural sciences further try to do is to establish the large-scale geography and history of the universe. It is a very important point emphasized by Quinton, that although the naturalness of a class is for him a primitive notion, nevertheless it admits of degrees. The class of the crimson things is actually contained within the class of the colored things. This helps to make the difference in degree of unity of the two classes a clear-cut matter. Coextensive properties are properties possessed by the very same class of things. Philosophy has been a long time coming to grips with the category of relation, Aristotle said of relations that they were "least of all things a kind of entity or substance".
