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HAving to treat of Purity and Impurity, in the second Book, which shall immediately follow this Chapter, and the Principles of Death being in a manner contained under this matter; I found it not out of purpose, to close this first Book
by a short Discourse upon these Principles, although to speak properly, they should not be called by this name; for it is proper to the nature of Principles ever to compound or generate, but never to destroy.
We have shewed heretofore, that Principles may be considered three several wayes, viz. Either before the composition of the Mixt, or in the state of its composition, or finally after dissolution and destruction: We may say the same here touching the Prin∣ciples of Death, which we have already said in another place concerning the Principles of Life. But because Contraries oppo∣sed one to the other, are better apprehended and illustrated, we shall say something again concerning the Principles of Life be∣fore the composition of the Mixt, that we may the better come to the knowledge of the Principles of Death, when we shall speak of it in the third Section; for we shall referre our selves so speak of their effects, being already corporified or embodyed in Mixts, when we come to treat of Purity and Impurity.