"Well, given that string of deductions, I would say you're doing quite well on that count."

There's something rather charming about a small boy devoted to Holmes's methods, already with some skill at it, with his own personal detective club with his friends. This is the only way Watson can interpret this.

Well, this sure is a thing. Watson shakes his head. "So, along this line of thinking, what year are you from? And how old are you, lad?"