"’pon my word, watson, you are coming along wonderfully. you have really done very well indeed. it is true that you have missed everything of importance, but you have hit upon the method, and you have a quick eye for colour. never trust to general impressions, my boy, but concentrate yourself upon details. my first glance is always at a woman’s sleeve. in a man it is perhaps better first to take the knee of the trouser. as you observe, this woman had plush upon her sleeves, which is a most useful material for showing traces. the double line a little above the wrist, where the typewritist presses against the table, was beautifully defined. the sewing-machine, of the hand type, leaves a similar mark, but only on the left arm, and on the side of it farthest from the thumb, instead of being right across the broadest part, as this was. i then glanced at her face, and, observing the dint of a pince-nez at either side of her nose, i ventured a remark upon short sight and typewriting, which seemed to surprise her."