"You are not speaking to the person you think you are addressing." For a moment Bok was taken aback.

Then he decided to go right to the point.
"Do I understand, Mr.Dodgson, that you are not 'Lewis Carroll'; that you did not write _Alice in Wonderland_ ?" For an answer the tutor rose, went into another room, and returned with a book which he handed to Bok.

"This is my book," he said simply.

It was entitled _An Elementary Treatise on Determinants_, by C.L.
Dodgson.

When he looked up, Bok found the author's eyes riveted on him.
"Yes," said Bok.