In the laboratory he could always find something to do on the
case, either in perfecting his chemical tests of the various drugs
we had discovered, or in trying to decipher some similarities in
the rough printing of the four warnings and the anonymous letter
with the known handwriting of those connected with the case, many
specimens of which he bad been quietly collecting. That in itself
was a tremendously minute job, entailing not only a vast amount of
expert knowledge such as he had collected in his years of studying
crime scientifically, but the most exact measurements and careful
weighing and balancing of trifles, which to the unscientific
conveyed no meanings at all. Still, he seemed to be forging ahead,
though he never betrayed what direction the evidence seemed to be
taking.
The package of cigarettes which he had ordered downtown was
delivered about an hour after his return and seemed to be the
signal for him to drop work, for the meeting with Lockwood and
Whitney had been set early. He stowed the package in his pockets
and then went over to a cabinet in which he kept a number of
rather uncommon drugs. From it he took a little vial which he
shoved into his waistcoat pocket.
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