odern Rivals."

(2) 2nd Edition of "Euc. and Mod. Rivals."

(3) A book of Math. curiosities, which I think of calling
"Pillow Problems, and other Math. Trifles." This will
contain Problems worked out in the dark, Logarithms without
Tables, Sines and angles do., a paper I am now writing on
"Infinities and Infinitesimals," condensed Long
Multiplication, and perhaps others.

(4) Euclid V.

(5) "Plain Facts for Circle-Squarers," which is nearly
complete, and gives actual proof of limits 3.14158, 3.14160.

(6) A symbolical Logic, treated by my algebraic method.

(7) "A Tangled Tale."

(8) A collection of Games and Puzzles of my devising, with
fairy pictures by Miss E.G. Thomson. This might also contain
my "Mem. Tech." for dates; my "Cipher-writing" scheme for
Letter-registration, &c., &c.

(9) Nursery Alice.

(10) Serious poems in "Phantasmagoria."

(11) "Alice's Adventures Underground."

(12) "Girl's Own Shakespeare." I have begun on "Tempest."

(13) New edition of "Parliamentary Representation."

(14) New edition of Euc. I., II.

(15) The new child's book, which Mr. Furniss is to
illustrate. I have settled on no name as yet, but it will
perhaps be "Sylvie and Bruno."

I have other shadowy ideas, _e.g._, a Geometry for
Boys, a vol. of Essays on theological points freely and
plainly treated, and a drama on "Alice" (for which Mr.
Mackenzie would write music): but the above is a fair
example of "too many irons in the fire!"

A letter written about this time to his friend, Miss Edith Rix, gives
some very good hints about how to work, all the more valuable because
he had himself successfully carried them out. The first hint was as
follows:--

When you have made a thorough and reasonably long effort, to
understand a thing, and still feel puzzled by it,
_stop_, you will only hurt yourself by going on. Put it
aside till the next morning; and if _then_ you can't
make it out, and have no one to explain it to you, put it
aside entirely, and go back to that part of the subject
which you _do_ understand. When I was reading
Mathematics for University honours, I would sometimes, after
working a week or two at some new book, and mastering ten or
twenty pages, get into a hopeless muddle, and find it just
as bad the next morning. My rule was _to begin the