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Tckbrff had ended this Account, I took my Leave of him, and repair'd to my Lodgings, to go to Rest, being sufficiently tir'd with the Labours of the Day; but I must not omit that I supp'd before I lay down. I had not been long in Bed before I fell into a profound Sleep, in which I had the following Dream. I do not doubt but that lying down upon a full Stomach, might, partly by the Vapours which ascended from my Stomach to my Brain, contribute something to set my Imagination to work; and if the Vapours which ascend from the Stomach to the Head affect the Imagination, I can very well account for the Extravagance and Incoherence of my Dream, since those Vapours must consist of something compounded of the different Sorts of Things which I eat: Yet, not to beg the Question, I will confirm the Doctrine of I know not what Vapours ascending from the Stomach to the Brain, by the Testimony of every old Woman that can order a Vomit for the Head-Ach; and as those Vapours were material, that is, compos'd of Matter finely prepared, and as all Matter must have some Form, it is certain that the Parts of Matter which constituted those Vapours were of several different Forms. Now it is confess'd that those different Forms of the Parts of Matter, is the Reason of the Difference which we perceive in Bodies by