1. Are they co-ordinate as agent and re-agent;
  1. Or is the one subordinate to the other, as effect to cause, and which is the cause or ground, which the effect or product;
  1. Or are they co-ordinate, but not inter-dependent, that is, per harmonium præstabilitam.

Ib. p. 4.

Now so far as we understand the nature of any being, we can certainly tell what is contrary and contradictious to its nature; as that accidents should subsist without their subject, &c.

That accidents should subsist (rather, exist) without a subject, may be a contradiction, but not that they exist without this or that subject. The words 'their subject' are

a petitio principii

.