1. The ideal reasoner would when he has once been shown a single fact in all its bearing, deduce from it not only all the chain of events which led up to it, but also all the results which would follow from it. (FIVE)

  2. The observer who has thoroughly understood one link in a series of incidents, should be able accurately to state all the other ones, both before and after. (FIVE)

  3. Problems may be solved in the study which have baffled all those who have sought a solution by the aid of their senses. To carry the art, however, to its highest pitch, it is necessary that the reasoner should be able to utilize all the facts which have come to his knowledge, and this in itself implies, as you will readily see, a possession of all knowledge, which, even in these days of free education and encyclopaedias, is a somewhat rare accomplishment. (FIVE)

  4. It is not so impossible, however, that a man should possess all knowledge which is likely to be useful to him in his work, and this, I have endeavoured in my case to do. (FIVE)

  5. A man should keep his little brain attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library where he can get it if he wants it. (FIVE)

  6. If the art of the detective began and ended in reasoning from an armchair, my brother would be the greatest criminal agent that ever lived. (GREE)

  7. I am an omnivorous reader with a strangely retentive memory for trifles. (LION)

  8. Education never ends, Watson. It is a series of lessons, with the greatest for the last. (REDC)

  9. It is a hobby of mine to have an exact knowledge of London. (REDH)

  10. I consider that a man's brain originally is like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him gets crowded out, or at best is jumbled up with a lot of other things, so that he has a difficulty in laying his hands upon it. Now the skilful workman is very careful indeed as to what he takes into his brain-attic. He will have nothing but the tools which may help him in doing his work, but of these he has a large assortment, and all in the most perfect order. It is a mistake to think that that little room has elastic walls and can distend to any extent. Depend upon it - there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones. (STUD)

  11. From a drop of water a logician could infer the possibility of an Atlantic or a Niagra without having seen or heard of one or the other. So all life is a great chain, the nature of which is known whenever we are shown a link of it. (STUD)

  12. Like all other arts, the science of deduction and analysis is one which can only be acquired by long and patient study, nor is life long enough to allow any mortal to attain the highest possible perfection in it. Before turning to those moral and mental aspects of the matter which present the greatest difficulties, let the inquirer begin by mastering more elementary problems. Let him, on meeting a fellow-mortal, learn at a glance to distinguish the history of man, and the trade or profession to which he belongs. Puerile as such an exercise may seem, it sharpens the faculties of observation, and teaches one where to look and what to look for. (STUD)

  13. What the deuce is it (the solar system) to me? You say that we go round the sun. If we went round the moon it would not make a pennyworth of difference to me or my work. (STUD)

  14. All knowledge comes useful to the detective. (VALL)

  15. Breadth of view is one of the essentials of our profession. The interplay of ideas and the oblique uses of knowledge are often of extraordinary interest. (VALL)

  16. In my profession all sorts of odd knowledge comes useful, and this room of yours is a storehouse of it. (3GAR)
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