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"The last link," he cried, exultantly. "My case is complete."

The two detectives stared at him in amazement.

"I have now in my hands," my companion said, confidently,
"all the threads which have formed such a tangle. There are,
of course, details to be filled in, but I am as certain of
all the main facts, from the time that Drebber parted from
Stangerson at the station, up to the discovery of the body of
the latter, as if I had seen them with my own eyes. I will
give you a proof of my knowledge. Could you lay your hand
upon those pills?"

"I have them," said Lestrade, producing a small white box;
"I took them and the purse and the telegram, intending to have
them put in a place of safety at the Police Station. It was
the merest chance my taking these pills, for I am bound to
say that I do not attach any importance to them."

"Give them here," said Holmes. "Now, Doctor," turning to me,
"are those ordinary pills?"

They certainly were not. They were of a pearly grey colour,
small, round, and almost transparent against the light.
"From their lightness and transparency, I should imagine that
they are soluble in water," I remarked.

"Precisely so," answered Holmes. "Now would you mind going
down and fetching that poor little devil of a terrier which
has been bad so long, and which the landlady wanted you to
put out of its pain yesterday."

I went downstairs and carried the dog upstair in my arms.
It's laboured breathing and glazing eye showed that it was
not far from its end. Indeed, its snow-white muzzle
proclaimed that it had already exceeded the usual term of
canine existence. I placed it upon a cushion on the rug.

"I will now cut one of these pills in two," said Holmes,
and drawing his penknife he suited the action to the word.
"One half we return into the box for future purposes.
The other half I will place in this wine glass, in which
is a teaspoonful of water. You perceive that our friend,
the Doctor, is right, and that it readily dissolves."

"This may be very interesting," said Lestrade, in the injured
tone of one who suspects that he is being laughed at,
"I cannot see, however, what it has to do with the death of
Mr. Joseph Stangerson."

"Patience, my friend, patience! You will find in time that
it has everything to do with it. I shall now add a little
milk to make the mixture palatable, and on presenting it to
the dog we find that he laps it up readily enough."

As he spoke he turned the contents of the wine glass into a
saucer and placed it in front of the terrier, who speedily
licked it dry. Sherlock Holmes' earnest demeanour had so far
convinced us that we all sat in silence, watching the animal
intently, and expecting some startling effect. None such
appeared, however. The dog continued to lie stretched upon
tho {16} cushion, breathing in a laboured way, but apparently
neither the better nor the worse for its draught.

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