Mrs. Wadman wants to know Toby's state of health. She's read some anatomy textbooks, but she doesn't really understand it. She's even asked Dr. Slop about Toby's injury. He swears that Toby's recovered but doesn't say anything more.
So she asks Toby about it. Her questions don't really get at the right answer, so she finally asks him right out: where did he get the wound?
He calls for Trim to bring his map and places Mrs. Wadman's finger on exactly the location where he received the wound.