that fire cannot alter the actions of several bodies to its own blas; and therefore, since a living and a dead Body (as they call them) are not the same, (for the actions or motions of life, by their change or alteration, have altered the nature or figure of the body) the effects cannot be the same; for a Carcass has neither the interior nor exterior motions of that figure which it was before it was a Carcass, and so the figure is quite alter'd from what it was, by the change and alteration of the motions. But to conclude, the motions of the exterior Agent, and the motions of the Patient, do sometimes joyn and unite, as in one action, or to one effect, and sometimes the motions of the Agent are onely an occasion, but not a co-workman in the production of such or such an effect, as the motions of the Patient do work; neither can the motions of the Agent work totally and meerly of themselves, such or such effects, without the assistance or concurrence of the motions of the Patient, but the motions of the Patient can; and there is nothing that can prove more evidently that Matter moves it self, and that exterior agents or bodies are onely an occasion to such or such a motion in another body, then to see how several things put into one and the same fire, do alter after several modes; which shews, it is not the onely action of fire, but the interior motions of the body thrown into the fire, which do alter its exterior form or figure. And thus, I think I have said enough to make my opinions clear, that they may be the better understood: which is the onely aim and desire of, Madam, _Your humble and_ _faithful Servant._ [1] Of the disease of the Stone, _Ch._ 9. XIX. _MADAM,_