The Adventures of Sherlock Holmes
"You have an answer to everything. But how on earth do you deduce that the gas is not laid on in his house?"
"One tallow stain, or even two, might come by chance; but when I see no less than five, I think that there can be little doubt that the individual must be brought into frequent contact with burning tallow – walks upstairs at night probably with his hat in one hand and a guttering candle in the other. Anyhow, he never got tallow-stains from a gas-jet. Are you satisfied?"
"Well, it is very ingenious," said I, laughing (Carbuncle.45-7).
"You must not fear," said he soothingly, bending forward and patting her forearm. "We shall soon set matters right, I have no doubt. You have come in by train this morning, I see."
"You know me, then?"
"No, but I observe the second half of a return ticket in the palm of your left glove. You must have started early, and yet you had a good drive in a dog-cart, along heavy roads, before you reached the station."
The lady gave a violent start and stared in bewilderment at my companion (Band.12-6).