the illustrating of his books more a matter of artistic
interest than of professional profit. I was _seven years_
illustrating his last work, and during that time I had the
pleasure of many an interesting meeting with the fascinating
author, and I was quite repaid for the trouble I took, not
only by his generous appreciation of my efforts, but by the
liberal remuneration he gave for the work, and also by the
charm of having intercourse with the interesting, if
somewhat erratic genius.

A book very different in character from "Sylvie and Bruno," but under
the same well-known pseudonym, appeared about the same time. I refer
to "Pillow Problems," the second part of the series entitled "Curiosa
Mathematica."

"Pillow Problems thought out during wakeful hours" is a collection of
mathematical problems, which Mr. Dodgson solved while lying awake at
night. A few there are to which the title is not strictly applicable,
but all alike were worked out mentally before any diagram or word of
the solution was committed to paper.

The author says that his usual practice was to write down the
_answer_ first of all, and afterwards the question and its
solution. His motive, he says, for publishing these problems was not
from any desire to display his powers of mental calculation. Those who
knew him will readily believe this, though they will hardly be
inclined to accept his own modest estimate of those powers.

Still the book was intended, not for the select few who can scale the
mountain heights of advanced mathematics, but for the much larger