He opened the green case and took from it a little flask, fitted for Marsh's arsenic test, with a safety funnel and escape tube, a small folding tripod, a spirit lamp and a disc of asbestos to serve as a sand-bath. Dropping into the flask several of the cindery masses, selected after careful inspection, he filled it up with alcohol and placed it on the disc, which he rested on the tripod. Then he lighted the spirit lamp underneath and sat down to wait for the alcohol to boil.
"There is one little point that we may as well settle," he said presently, as the bubbles began to rise in the flask. "Give me a slide with a drop of Farrant on it, Jervis."
I prepared the slide while Thorndyke, with a pair of forceps, picked out a tiny wisp from the table-cloth. "I fancy we have seen this fabric before," he remarked, as he laid the little pinch of fluff in the mounting fluid and slipped the slide onto the stage of the microscope. "Yes," he continued, looking into the eye-piece, "here are our old acquaintances, the red wool fibres, the blue cotton and the yellow jute. We must label this at once or we may confuse it with the other specimens."
"Have you any idea how the deceased met his death?" the inspector asked.
"Yes," replied Thorndyke. "I take it that the murderer enticed him into this room and gave him
