"The tremendous exertions which I have gone through during the last day or two have worn me out.

Not so much bodily exertion, you understand, as the strain upon the mind.

You will appreciate that, Mr.Sherlock Holmes, for we are both brain-workers." "You do me too much honour," said Holmes, gravely.

"Let us hear how you arrived at this most gratifying result." The detective seated himself in the arm-chair, and puffed complacently at his cigar.

Then suddenly he slapped his thigh in a paroxysm of amusement.
"The fun of it is," he cried, "that that fool Lestrade, who thinks himself so smart, has gone off upon the wrong track altogether.