is the same as to consider whether demonstrations proceed to infinity, and whether there is demonstration of every thing, or whether there is a termination (of the extremes) relatively to each other.
I say also the same in respect of negative syllogisms and propositions, for instance, whether A is primarily present with no B, or there will be a certain medium with which it was not before present, as if G (is a medium), which is present with every B; and again, with something else prior to this, as whether (the medium is) H, which is present with every G; for in these also, either those are infinite with which first they are present, or the progression stops.
The same thing however does not occur in things which are convertible, since in those which are mutually predicated of each other, there is nothing of which first or last a thing is predicated; for in this respect all things subsist similarly with respect to all, whether those are infinite, which are predicated of the same, or whether both subjects of doubt are infinite, except that the conversion cannot be similarly made; but the one is as accident, but the other as predication.
