Accompanied by Wilson, who was deeply interested in the work, he examined each room, and found similar chalk-marks in two other apartments. He noticed, also, two circles on the oaken panels, an arrow on a wainscot, and four figures on four steps of the stairs. At the end of an hour Wilson said:
“The figures are correct, aren’t they?”
“I don’t know; but, at all events, they mean something,” replied Sholmes, who had forgotten the discomforts of the night in the joy created by his new discoveries.
“It is quite obvious,” said Wilson, “they represent the number of pieces in the floor.”
“Ah!”
“Yes. And the two circles indicate that the panels are false, as you can readily ascertain, and the arrow points in the direction in which the panels move.”
Herlock Sholmes looked at Wilson, in astonishment.
“Ah! my dear friend, how do you know all that? Your clairvoyance makes my poor ability in that direction look quite insignificant.”
“Oh! it is very simple,” said Wilson, inflated with pride; “I examined those marks last night, according to your instructions, or, rather, according to the instructions of Arsène Lupin, since he wrote the letter you sent to me.”
At that moment Wilson faced a greater danger than he had during his struggle in the garden with Herlock Sholmes. The latter now felt a furious desire to strangle him. But, dominating his feelings, Sholmes made a grimace which was intended for a smile, and said: