for
the camera. The picture may be developed by a solution of gallic acid
mixed with a very small quantity of an aqueous solution of acetic acid
and nitrate of silver. The picture is fixed by washing with hyposulphite
of soda. If you wish to derive any pleasure from photography, you would
better drop the old-fashioned paper process, and turn your attention to
ferrotypes, or negatives on glass, as with them good results are more
easily obtained than with paper.

* * * * *

We acknowledge very pretty and neatly written letters from St. Clair
Nichol, Listowel, Ontario, and Charles L. Benjamin (nine years old),
Washington, D. C., both containing correct information respecting Sir
Rowland Hill.

* * * * *

CLARISSA H. H.--Your answer to No. 4 of the mathematical puzzles is
right. If you look carefully you will discover why the others are wrong.

* * * * *

G. A. Page sends correct answers to Nos. 1, 3, and 4 of the mathematical
puzzles in our second number; also to numerical charade. Many thanks to
"an instructor and lover of young people" for her kind note. We are
sorry it is anonymous.

* * * * *

A correspondent sends answers to puzzles which we have not considered,
as no signature accompanies them. Our young friends will please sign
their full names to communications, which we will not print if so
requested.

_Harper's Young People._

HARPER'S YOUNG PEOPLE will be issued every Tuesday, and may be had at
the following rates:

Four cents a number.

Single subscriptions for one year, $1.50; five subscriptions, one year,
$7.00: payable in advance. Postage free.

Subscriptions may begin with any number. When no time is specified, it
will be understood that the subscriber desires to commence with the
number issued after the receipt of order.

Remittances should be made by Post-office Money Order, or Draft, to
avoid risk of loss.

Published by HARPER & BROTHERS, New York.

A LIBERAL OFFER FOR 1880 ONLY.

HARPER'S YOUNG PEOPLE _and_ HARPER'S WEEKLY _will be sent to any address
for one year, commencing with the first number of_ HARPER'S WEEKLY _for
January, 1880, on receipt of $5.00 for the two Periodicals_.

[Illustration]

"Little Polly, will you go a-walking to-day?"
"Indeed, little Susan, I will, if I may."
"Little Polly, your mother has said you may