Page:Popular Science Monthly Volume 69.djvu/600

 A New BAUSCH&LOMB

School Microscope

Special Prices Quoted to Schools

A most practical, low- priced instrument for sec- ondary and high-school use. The new construction of arm with hand hold and fine ad- justment makes it especially durable for inexperienced pupils to use.

This microscope has coarse and fine adjustments, 2 eye pieces, \ and £ objec- tives, double nose piece and iris diaphragm in stage.

This microscope should interest every teacher.

It has so many new fea- tures that can not be told of here that you should send for circular.

BH4 Microscope Sao 50

Bausch & Lomb Optical Co.,

Rochester, N. Y.

New York, Boston, Washington, Chicago, San Francisco, Frankfort a/m Germany.

Objects

especially prepared and classified for the use of

Teachers and Students in

Botany, Entomology, Zoology, Physiology and Bacteriology,

also

special sets of objects covering Cotton and Woolen Fibres, Paper Making, Starches, Pharmaceutical Preparations, etc.

The quality of our preparations is un- equalled, while the prices are extremely low.

We also offer over 20,000 Lantern Slides covering a great number of Educational Subjects, Complete catalogue free.

WILLIAMS, BROWN & EARLE, Dept. N.918 Chestnut St., Philadelphia, Pa.

Microscopical

Fossils, Minerals,

Shells, Mounted Birds and Mammals

For the amateur or advanced collector. Tools and supplies for all kinds of Natural History work. Illustrated catalogue free.

Box 377

A. W.JONES,

Salina, Kansas

The

Modern

Business Necessity ^^ CAPACITY.

The famous Calculating Machine. Enthusiastically endorsed the world over. Rapid, accurate, simple, durable. Two models: ox- idized copper finish, $5.00; oxidized silver finish, $10.00, prepaid la U. S. Write for Free Booklet and Special Offer. Agents wanted.

C. E. Locke Mfg. Co. 182 Walnut St., Kensett, Iowa 1

STEREOPTICON NATURE STUDY SLIDES

We are just completing fine sets of slides on Nature subjects comprising amongst others,

30 subjects on "Bird Babies " 30/60 "Bird's Nests and Eggs" 50/60 "Butterflies and Moths " 40 "A half hour at the seaside n 16 "Bird's Beaks "

Also in preparation a set on Wild Flowers.

Besides the above we have slides of every part of the world. Illustrated Stories, Bible Subjects, Educational and Comics.

OVER 20,000 SLIDES IN STOCK

FOR

SALE OR RENTAL

Slides, plain, 25c. & 35c. Colored, from 50c. each up. Catalogues, 20c. Hire Lists, free.

RILEY OPTICAL INSTRUMENT CO.

23 East Fourteenth St., New York.