To conclude my discourse upon the Opinions of these two famous and learned Authors, which I have hitherto sent you in several Letters, I could not chuse but repeat the ground of my own opinions in this present; which I desire you to observe well, lest you mistake any thing, whereof I have formerly discoursed. First I am for self-moving matter, which I call the sensitive and rational matter, and the perceptive and architectonical part of nature, which is the life and knowledg of nature. Next I am of an opinion, That all Perception is made by corporeal, figuring self-motions, and that the perception of forreign objects is made by patterning them out: as for example, The sensitive perception of forreign objects is by making or taking copies from these objects, so as the sensitive corporeal motions in the eyes copy out the objects of sight, and the sensitive corporeal motions in the ears copy out the objects of sound; the sensitive corporeal motions in the nostrils, copy out the objects of sent; the sensitive corporeal motions in the tongue and mouth, copy out the objects of taste, and the sensitive corporeal motions in the flesh and skin of the body copy out the forreign objects of touch; for when you stand by the fire, it is not that the fire, or the heat of the fire enters your flesh, but that the sensitive motions copy out the objects of fire and heat. As for my Book of Philosophy, I must tell you, that it treats more of the production and architecture of Creatures then of their perceptions, and more of the causes then the effects, more in a general then peculiar way, which I thought necessary to inform you of, and so I remain, Madam, _Your faithful Friend_ _and Servant._ XLIII. _MADAM,_