thoughts have a particular mechanical dependence only on my own previous thoughts or sensations. I do not remember the feelings of any one but myself. I may, indeed, remember the objects which must have caused such and such feelings in others, or the outward signs of passion which accompanied them. These, however, are but the recollections of my own immediate impressions of what I saw, and I can only form an idea of the feelings themselves by means of the imagination. But, though we take away all power of imagination from the human mind, my own feelings must leave behind them certain traces, or representations of themselves retaining the same general properties, and having the same intimate connexion with the conscious principle. On the other hand, if I wish to anticipate my own future feelings, whatever these may be, I must do so by means of the same faculty by which I conceive of those of others, whether past or future. I have no distinct or separate faculty on which the events and feelings of my future being are impressed before hand, and which shows, as in an enchanted mirror, to me, and me alone, the reversed picture of my future life. It is absurd to suppose that the feelings which I am to have hereafter, should excite certain correspondent impressions of themselves before they have existed, or act mechanically upon my mind by a secret sympathy. The romantic sympathies of lovers, the exploded dreams of judicial astrology, the feats of magic, do not equal the solid, substantial absurdity of this doctrine of self-interest, which attributes to that which is not and has not been, a mechanical operation and a reality in nature. I can only abstract myself from this present being, and take an interest in my future being, in the same sense and manner in which I can go out of myself entirely, and enter into the minds and feelings of others. In short, there neither is nor can be any principle belonging to the individual that antecedently identifies his future events with his present sensation, or that reflects the impression of his future feelings backwards with the same kind of consciousness that his past feelings are transmitted forward through the channels of memory. The size of the river as well as its taste depends on the water that has already fallen into it. I cannot roll back its course, nor is the stream next the source affected by the water which falls into it afterwards, yet we call both the same river. Such is the nature of personal identity. It is founded on the continued connexion of cause and effect, and awaits their gradual progress, and does not consist in a preposterous and wilful unsettling of the natural order of things. There is an illustration of this argument, which, however quaint or singular it may appear, I rather choose to give than omit any thing which may serve to make my meaning clear and intelligible. Suppose then a number of men employed to cast a mound into the sea.