Before he had time to start for the door, Bisset's mysterious efficiency was made manifest again. Precisely as he was wanted, he appeared, and this time it was clear that his own efforts had not been altogether fruitless. He had in fact an air of even greater complacency than usual. "I have arrived at certain conclusions, sir," he announced. XIII THE DEDUCTIVE PROCESS Bisset laid on the table a sheet of note paper. "Here," said he, "is a kin' of bit sketch plan of the library. Observing this plan attentively, you will notice two crosses, marked A and B. A is where yon wee table was standing--no the place against the wall where it was standing this morning, but where it was standing before it was knocked over last night. B is where the corp was found. You follow that, sir?" Ned nodded. "I follow," said he. "Now, the principle in a' these cases of crime and detection," resumed the philosopher, assuming his lecturer's air, "is noticing such sma' points of detail as escape the eye of the ordinar' observer, taking full and accurate measurements, making a plan with the principal sites carefully markit, and drawing, as it were, logical conclusions. Applying this method now to the present instance, Mr. Cromarty, the first point to observe is that the room is twenty-six feet long, measured from the windie, which is a bit recessed or set back, as it were, to the other end of the apartment. Half of 26 is 13, and if you take the half way line and draw approximate perpendiculars to about where the table was standing and to as near as one can remember where the middle of the corp roughly was lying, you get exactly six feet ten and five-eighths inches, in both cases." "An approximate perpendicular to roughly about these places gives this exact measurement?" repeated Cromarty gravely. "Well, what next?" "Well, sir, I'll not insist too much on the coincidence, but it seems to me vera remarkable. But the two significant features of this case seem to me yon table being upset over by the windie and the corp being found over by the door." "You're talking horse sense now," murmured Ned. "Now, yon table was upset by Sir Reginald falling on it!" Ned looked at him keenly. "How do you know?" "Because one of the legs was broken clean off!" "What, when we saw it this morning?" "We had none of us noticed it then, sir; but I've had a look at it since, and there's one leg broken fair off at the top. The break was half in the socket, as it were, leaving a kind of spike, and if you stick that into the socket you can make the table look as good as new. It's all right, in fac', until you try to move it, and then of course the leg just drops out." "And it wasn't like that yesterday?"