layers of a rock; or when, on opening a book, we light upon an insect accidentally crushed within the leaves. Memories of this kind are always sweet and pleasant.
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It occasionally happens that, for no particular reason, long-forgotten scenes suddenly start up in the memory. This may in many cases be due to the action of some hardly perceptible odour, which accompanied those scenes and now recurs exactly same as before. For it is well known that the sense of smell is specially effective in awaking memories, and that in general it does not require much to rouse a train of ideas. And I may say, in passing, that the sense of sight is connected with the understanding,[1] the sense of hearing with the reason,[2] and, as we see in the present case, the sense of smell with the memory. Touch and Taste are more material and dependent upon contact. They have no ideal side.
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It must also be reckoned among the peculiar attributes of memory that a slight state of intoxication often so greatly enhances the recollection of past times and scenes that all the circumstances connected with them come back much more clearly than would be possible in a state of sobriety; but that, on the other hand, the recollection of what one said or did while the intoxication lasted is more than usually imperfect; nay, that if one has been absolutely tipsy, it is gone altogether. We may say, then, that
