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There is a curious and interesting discussion on the comparative distinctness of our visual and other external impressions, in Mr. Fearn’s Essay on Consciousness, with which I shall try to descend from this rhapsody to the ground of common sense and plain reasoning again. After observing, a little before, that ‘nothing is more untrue than that sensations of vision do necessarily leave more vivid and durable ideas than those of grosser senses,’ he proceeds to give a number of illustrations in support of this position. ‘Notwithstanding,’ he says, ‘the advantages here enumerated in favour of sight, I think there is no doubt that a man will come to forget acquaintance, and many other visible objects, noticed in mature age, before he will in the least forget taste and smells, of only moderate interest, encountered either in his childhood or at any time since.

‘In the course of voyaging to various distant regions, it has several times happened that I have eaten once or twice of different things that never came in my way before nor since. Some of these have been pleasant, and some scarce better than insipid; but I have no reason to think I have forgot, or much altered the ideas left by those single impulses of taste; though here the memory of them certainly has not been preserved by repetition. It is clear I must have seen as well as tasted those things; and I am decided that I remember the tastes with more precision than I do the visual sensations.

‘I remember having once, and only once, eat Kangaroo in New Holland; and having once smelled a baker’s shop having a peculiar odour in the city of Bassorah. Now both these gross ideas remain with me quite as vivid as any visual ideas of those places; and this could not be from repetition, but really from interest in the sensation.

‘Twenty-eight years ago, in the island of Jamaica, I partook (perhaps twice) of a certain fruit, of the taste of which I have now a very fresh idea; and I could add other instances of that period.

‘I have had repeated proofs of having lost retention of visual objects, at various distances of time, though they had once been familiar. I have not, during thirty years, forgot the delicate, and in itself most trifling sensation that the palm of my hand used to convey, when I was a boy, trying the different effects of what boys call light and heavy tops; but I cannot remember within several shades of the brown coat which I left off a week ago. If any man thinks he can do better, let him take an ideal survey of his wardrobe, and then actually refer to it for proof.

‘After retention of such ideas, it certainly would be very difficult to persuade me that feeling, taste, and smell can scarce be said to leave ideas, unless indistinct and obscure ones. . . .

‘Show a Londoner correct models of twenty London churches, and, at the same time, a model of each, which differs, in several considerable features, from the truth, and I venture to say he shall not tell you, in any instance, which is the correct one, except by mere chance.

‘If he is an architect he may be much more correct than any ordinary person: and this obviously is because he has felt an interest in viewing these structures, which an ordinary person does not feel: and here interest is the sole reason of his remembering more correctly than his neighbour.

‘I once heard a person quaintly ask another, How many trees there are in St. Paul’s churchyard? The question itself indicates that many cannot answer it; and this is found to be the case with those who have passed the church a hundred times: whilst the cause is, that every individual in the busy stream which glides past St. Paul’s is engrossed in various other interests.