.

.
Ames, I understand that you have often seen this very unusual mark--a branded triangle inside a circle--upon Mr.Douglas's forearm ?" "Frequently, sir." "You never heard any speculation as to what it meant ?" "No, sir." "It must have caused great pain when it was inflicted.

It is undoubtedly a burn.

Now, I observe, Ames, that there is a small piece of plaster at the angle of Mr.Douglas's jaw.

Did you observe that in life ?" "Yes, sir, he cut himself in shaving yesterday morning." "Did you ever know him to cut himself in shaving before ?" "Not for a very long time, sir." "Suggestive!" said Holmes.