1. What it is for one thing to differ from another.—2. To differ in number, magnitude, species, and genus, what.—3. What is relation, proportion, and relatives.—4. Proportionals, what.—5. The proportion of magnitudes to one another, wherein it consists.—6. Relation is no new accident, but one of those that were in the relative before the relation or comparison was made. Also the causes of accidents in the correlatives, are the cause of relation.—7. Of the beginning of individuation. [Sidenote: What it is for one thing to differ from another.] 1. Hitherto I have spoken of body simply, and accidents common to all bodies, as _magnitude_, _motion_, _rest_, _action_, _passion_, _power_, _possible_, _&c._; and I should now descend to those accidents by which one body is distinguished from another, but that it is first to be declared what it is to be _distinct_ and _not distinct_, namely, what are the SAME and DIFFERENT; for this also is common to all bodies, that they may be distinguished and differenced from one another. Now, two bodies are said to _differ_ from one another, when something may be said of one of them, which cannot be said of the other at the same time. [Sidenote: To differ in number, magnitude, species, and genus, what.] 2. And, first of all, it is manifest that no two bodies are the _same_; for seeing they are two, they are in two places at the same time; as that, which is the _same_, is at the same time in one and the same place. All bodies therefore differ from one another in _number_, namely, as one and another; so that the _same_ and _different in number_, are names opposed to one another by contradiction. In _magnitude_ bodies differ when one is greater than another, as _a cubit long_, and _two cubits long_, of _two pound weight_, and of _three pound weight_. And to these, _equals_ are opposed. Bodies, which differ more than in magnitude, are called _unlike_; and those, which differ only in magnitude, _like_. Also, of unlike bodies, some are said to differ in the _species_, others in the _genus_; in the _species_, when their difference is perceived by one and the same sense, as _white_ and _black_; and in the _genus_, when their difference is not perceived but by divers senses, as _white_ and _hot_. [Sidenote: What is relation, proportion, and relatives.]