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As in the latter case the imagination discovers not so entire an union as in the former, but is able to trace and preserve a distinct idea of the property of each; this is the reason, why the civil law, tho' it established an entire community in the case of confusion, and after that a proportional division, yet in the case of commixtion, supposes each of the proprietors to maintain a distinct right; however necessity may at last force them to submit to the same division.
If those streams of air, therefore, shall be supposed as both sufficiently saturated with humidity, then, as they are of different temperatures, there would be formed a continual condensation of aqueous vapor, in some middle region of the atmosphere, by the commixtion of part of those two opposite streams.
But here I cannot forbear taking notice of a remarkable subtilty of the Roman law, in distinguishing betwixt confusion and commixtion. Confusion is an union of two bodies, such as different liquors, where the parts become entirely undistinguishable. Commixtion is the blending of two bodies, such as two bushels of corn, where the parts remain separate in an obvious and visible manner.
Either this universe is a mere confused mass, and an intricate context of things, which shall in time be scattered and dispersed again: or it is an union consisting of order, and administered by Providence. If the first, why should I desire to continue any longer in this fortuit confusion and commixtion? or why should I take care for anything else, but that as soon as may be I may be earth again?
And that the prohibition which forbade the commixtion of beasts of diverse kinds among the Jews hath a figurative sense, in that we are forbidden to make people of one kind of religion, to have any conjunction with those of another kind. Sixthly, Papists themselves teach, that it is generally forbidden to communicate with infidels and heretics, but especially in any act of religion.