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."
"But the Solar System!" I protested.
"What the deuce is it to me?" he interrupted impatiently; "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 to my work."
I was on the point of asking him what that work might be, but something
in his manner showed me that the question would be an unwelcome one. I
pondered over our short conversation, however, and endeavoured to draw
my deductions from it. He said that he would acquire no knowledge which
did not bear upon his object. Therefore all the knowledge which he
possessed was such as would be useful to him. I enumerated in my own
mind all the various points upon which he had shown me that he was
exceptionally well-informed. I even took a pencil and jotted them down.
I could not help smiling at the document when I had completed it. It ran
in this way--
SHERLOCK HOLMES--his limits.
1. Knowledge of Literature.--Nil.
2. Philosophy.--Nil.
3. Astronomy.--Nil.
4. Politics.--Feeble.
5. Botany.--Variable. Well up in belladonna,
opium, and poisons generally.
Knows nothing of practical gardening.
6. Geology.--Practical, but limited.
Tells at a glance different soils
from each other. After walks has
shown me splashes upon his trousers,
and told me by their colou
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