sics
for colleges and advanced preparatory schools.

Hammel's Observation Blanks in Physics
By WILLIAM C.A. HAMMEL.
Flexible, quarto, 42 pages. Illustrated 30 cents
A pupil's laboratory manual and notebook for the first term's work.
Blanks are left in which the pupil writes his observations and the
principles illustrated.

_Copies of any of these books will be sent, prepaid, to any address on
receipt of the price by the Publishers:_

American Book Company

NEW YORK . CINCINNATI . CHICAGO

* * * * *

Laboratory Physics

Hammel's Observation Blanks in Physics

By WILLIAM C.A. HAMMEL, Professor of Physics in Maryland State
School, Boards, Quarto, 42 pages. Illustrated 30 cents

These Observation Blanks are designed for use as a Pupil's Laboratory
Manual and Note Book for the first term's work in the study of Physics.
They combine in convenient form descriptions and illustrations of the
apparatus required for making experiments in Physics, with special
reference to the elements of Air, Liquids, and Heat; directions for
making the required apparatus from simple inexpensive materials, and for
performing the experiments, etc. The book is supplied with blanks for
making drawings of the apparatus and for the pupil to record what he has
observed and inferred concerning the experiment and the principle
illustrated.

The experiments are carefully selected in the light of experience and
arranged in logical order. The treatment throughout is in accordance
with the best laboratory practice of the day.

Hon. W.T. Harris, U.S. Commissioner of Education, says of these Blanks:

"I have seen several attempts to assist the work of pupils engaged in
the study of Physics, but I have never seen anything which promises to
be of such practical assistance as Hammel's Observation Blanks."

_Specimen copies of the above book will be sent prepaid to any address,
on receipt of the price, by the Publishers:_

American Book Company

NEW YORK . CINCINNATI . CHICAGO

* * * * *

Burnet's Zooelogy

FOR

HIGH SCHOOLS AND ACADEMIES

BY

MARGARETTA BURNET
Teacher of Zooelogy, Woodward High School, Cincinnati, O.

Cloth, 12mo, 216 pages. Illustrated. Price, 75 cents

This new text-book on Zooelogy is intended for classes in High Schools,
Academies, and other Secondary School