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.