e of them, "The Origin of Tree Worship," and it struck me that the
fellow must be some poor bibliophile who, either as a trade or as a
hobby, was a collector of obscure volumes. I endeavoured to apologize
for the accident, but it was evident that these books which I had so
unfortunately maltreated were very precious objects in the eyes of their
owner. With a snarl of contempt he turned upon his heel, and I saw his
curved back and white side-whiskers disappear among the throng.

My observations of No. 427, Park Lane did little to clear up the problem
in which I was interested. The house was separated from the street by
a low wall and railing, the whole not more than five feet high. It was
perfectly easy, therefore, for anyone to get into the garden, but the
window was entirely inaccessible, since there was no water-pipe or
anything which could help the most active man to climb it. More puzzled
than ever I retraced my steps to Kensington. I had not been in my study
five minutes when the maid entered to say that a person desired to
see me. To my astonishment it was none other than my strange old
book-collector, his sharp, wizened face peering out from a frame of
white hair, and his precious volumes, a dozen of them at least, wedged
under his right arm.

"You're surprised to see me, sir," said he, in a strange, croaking
voice.

I acknowledged that I was.

"Well, I've a conscience, sir, and when I chanced to see you go into
this house, as I came hobbling after you, I thought to myself, I'll just
step in and see that kind gentleman, and tell him that if I was a bit
gruff in my manner there was not any harm meant, and that I am much
obliged to him for picking up my books."

"You make too much of a trifle," said I. "May I ask how you knew who I
was?"

"Well, sir, if it isn't too great a liberty, I am a neighbour of yours,
for you'll find my little bookshop at the corner of Church Street,
and very happy to see you, I am sure. Maybe you collect yourself, sir;
here's 'British Birds,' and 'Catullus,' and 'The Holy War'--a bargain
every one of them. With five volumes you could just fill that gap on
that second shelf. It looks untidy, does it not, sir?"

I moved my head to look at the cabinet behind me. When I turned again
Sherlock Holmes was standing smiling at me across my study table. I rose
to my feet, stared at him for some seconds in utter amazement, and then
it appears that I must have fainted for the first and the las