Here, too, is a
curious little work upon the influence of a trade upon the form of
the hand, with lithotypes of the hands of slaters, sailors, cork-
cutters, compositors, weavers, and diamond-polishers. That is a
matter of great practical interest to the scientific detective --
especially in cases of unclaimed bodies, or in discovering the
antecedents of criminals. But I weary you with my hobby."
"Not at all," I answered earnestly. "It is of the greatest
interest to me, especially since I have had the opportunity of
observing your practical application of it. But you spoke just
now of observation and deduction. Surely the one to some extent
implies the other."
"Why, hardly," he answered, leaning back luxuriously in his
armchair and sending up thick blue wreaths from his pipe. "For
example, observation shows me that you have been to the Wigmore
Street Post-Office this morning, but deduction lets me know that
when there you dispatched a telegram."
"Right!" said I. "Right on both points! But I confess that I
don't see how you arrived at it. It was a sudden impulse upon
my part, and I have mentioned it to no one."
"It is simplicity itself," he remarked, chuckling at my
surprise -- "so absurdly simple that an explanation is superfluous;
and yet it may serve to define the limits of observation and of
deduction.
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