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Suddenly there was the momentary gleam of a light up in the

direction of the ventilator, which vanished immediately, but was

succeeded by a strong smell of burning oil and heated metal.

Someone in the next room had lit a dark-lantern. I heard a gentle

sound of movement, and then all was silent once more, though the

smell grew stronger. For half an hour I sat with straining ears.

Then suddenly another sound became audible-a very gentle,

soothing sound, like that of a small jet of steam escaping

continually from a kettle. The instant that we heard it, Holmes

sprang from the bed, struck a match, and lashed furiously with

his cane at the bell-pull.

"You see it, Watson?" he yelled. "You see it?"