visible also, is sensible. It is objected (perhaps), that it is not necessary there should be a consequence in relatives, as we have said, for the sensible is an object of science, but sense is not science, yet the objection does not appear to be true, for many deny that there is science of sensibles. Besides, what has been said is no less useful for (proving) the contrary, as that the sensible is not an object of science, since neither is sense, science.
Chapter 9
Again, we must both in subversion and construction, attend to elementary co-ordinates, and to cases, and such things are called co-ordinates, as just things, and a just man, with justice, and courageous deeds, and a courageous man, with courage. Likewise, also, things efficient, and conservative, are co-elementary with that, of which they are efficient, or conservative, as the salubrious, with health, and the productive of a good habit, with a good habit, of body. In the same manner with other things, whence it is usual to call such, coordinates, but cases, are such as justly, and courageously, and healthily, and whatever are spoken after this manner. Those also which are according to cases, seem to be co-ordinate, as justly with justice, and courageously with courage; but all those are called co-ordinate, which are in the same affinity, as justice, a just man, a just thing, justly. It is clear then, that when any one of these which are in the same affinity, is proved good or laudable, all the rest also have been shown so, as, if justice is one of things laudable, the just man, and the just thing, and the justly, are also of the number of things laudable, but justly, and laudably, will be enunciated according to the same case, from the laudable, as justly from justice.
Not only however is the contrary to be considered in what has been said, but also in the contrary, as that the good is not necessarily pleasant, for neither is the evil (necessarily) painful, or if this is, that also is, or so if justice is science, in-
