"He has coosiderable gifts himself. He possesses two
out of the three qualities necessary for the ideal detective. He has
the power of observation and that of deduction. He is only
wanting in knowledge, and that may come in time. He is now
translating my small works into French."
"Your works?"
"Oh, didn't you know?" he cried, laughing. "Yes, I have
been guilty of several monographs. They are all upon technical
subjects. Here, for example, is one 'Upon the Distinction be-
tween the Ashes of the Various Tobaccos.' In it I enumerate a
hundred and forty forms of cigar, cigarette, and pipe tobacco,
with coloured plates illustrating the difference in the ash. It is a
point which is continually turning up in criminal trials, and
which is sometimes of supreme importance as a clue. If you can
say definitely, for example, that some murder had been done by
a man who was smoking an Indian lunkah, it obviously narrows
your field of search. To the trained eye there is as much differ-
ence between the black ash of a Trichinopoly and the white fluff
of bird's-eye as there is between a cabbage and a potato."
"You have an extraordinary genius for minutiae," I remarked.
"I appreciate their importance. Here is my monograph upon
the tracing of footsteps, with some remarks upon the uses of
plaster of Paris as a preserver of impresses.
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