powers of observation have not been trained. A good detective has to school himself to remember all sorts of little facts like that, until it gets to be a habit with him. Both of you have been looking at Mr. Norton for about three years and you don't know the color of his hair. And if I asked you whether he was in the habit of wearing laced shoes or buttoned shoes you would be stumped altogether. As a matter of fact, Mr. Norton is bald and he wears a chestnut wig. You never noticed that? He always wears buttoned shoes, he belongs to the Elks, and his favorite author is Dickens."
The boys looked at their father in amazement.
"But, dad, you've never met him."
"I've never been introduced to him, but I've passed him on the street a number of times. When your powers of observation have been trained as mine have been it's no trick at all to take away a mental photograph of a man after seeing him once. If you are specially observant it isn't hard to notice such details as that regarding the wig. A wig never has the same appearance as natural hair."
"But how do you know he belongs to the Elks?" asked Joe.
"He wears the lodge emblem as a watch charm."
"And how do you know his favorite author is Dickens?"
