“I would have it a piece of education in all schools!” cried the Doctor angrily. “Where is the use of eyesight and articulate speech if a man cannot observe and recollect the features of his enemy? I, who know all the gangs of Europe, might have identified him, and gained new weapons for your defence. Cultivate this art in future, my poor boy; you may find it of momentous service.”
R. L. Stevenson