A laboratory manual with material selected and presented to emphasize the more important organic reactions, to develop a satisfactory technique, and to stimulate interest in research. For a full-year or the usual short course. $2.00

Published September, 12, 1927

A Laboratory Course
in General Zoology

By HENRY SHERRING PRATT, Professor
of Biology in Haverford College.

A revision of Dr. Pratt's popular "Course in Invertebrate Zoology" plus abbreviated and simplified dissections of the perch and the frog. Full and practical directions enabling the student to carry on his work independently make this course unusually teachable.

GINN AND COMPANY

$1.72

for the Average Chemical Laboratory

at a very moderate price

In this No. 851 will be found a Chemical Desk that ideally serves all the needs of the average school chemical laboratory, yet at a very moderate price.

In it is embodied all the essential features of more elaborate and expensive desks. The general arrangement of drawers, plumbing, etc., follows closely along the lines that have proven most serviceable. It accommodates sixteen students, working in sections of eight.

Kewaunee

Laboratory Furniture

The past few years have witnessed a wonderful transformation in the science equipment of the educational institutions of America.

Every science teacher knows the importance of properly designed, properly built laboratory furniture, and how much influence it exerts upon the character of work of the students.

Kewaunee has produced a line of Laboratory Furniture that has never been approached as a manufacturing product or an educational adjunct.

A copy of our Laboratory Book is free. Address all inquiries to the factory at Kewaunee.

Kewaunee Mfg. Co.

LABORATORY FURNITURE

C. G. CAMPBELL, Treas. and Gen. Mgr.

115 Lincoln St.
Kewaunee, Wis.

Chicago Office:

1511 Kimball Bldg., 25 E. Jackson Blvd. Offices in Principal Cities

New York Office

70 Fifth Avenue

Combination Type for Binocular and Monocular Vision
As well as for Photo-Micrography

Embodying Mechanical Features as Suggested by Prof. C. E. McClung, University of Pennsylvania

Leitz Microscopes having been selected by leading Educational Institutions and Government Departments

As Standard for Research

we are naturally eager to continue in our efforts to improve the mechanical
design of these microscopes and to add features by which their range of applica-
tion is increased and their usefulness still further enhanced.

As result of our endeavors, we are now pleased to offer:

Leitz Microscope Model "IURM"

which will command far-reaching recognition for Research Investigation and
Photo-Micrography.

Particular Features are:

Combination Rotary Mechanical Stage, 153 mm diameter,
with graduated Periphery;

Fine Adjustment Micrometer Screw at substage for accu-
rate focus of condenser;

Centering Adapter at substage for accurate centering of
illuminating rays.

Write for Pamphlet No. 1113 (0) E. LEITZ, Inc.

60 East 10th Street

AGENTS:

Pacific Coast States: SPINDLER & SAUPPE,
Offices at San Francisco and Los Angeles, Calif.

New York, N. Y.

Canada: THE J. F. HARTZ CO., Ltd., Toronto 2, Can. Philippine Ids.: BOTICA DE SANTA CRUZ, Manila. Cuba: ANTIGA & CO., Havana, Cuba.