wien wes : 
SCIENCE—ADVERTISEMENTS — 
Spencer Microscopes 
Our entire output of Microscopes is 
temporarily taken by the Medical Divi- 
sions of the U. S. Government. Weare 
happy to thus dedicate our facilities to 
the winning of the war. 
Although unable to accept further 
orders just now for Compound Micro- 
scopes, we are able to supply a limited 
number of Microscope Accessories, 
Microtomes, Dissecting Instruments, 
etc. Information given on request. 
SPENCER LENS COMPANY 
BUFFALO, N. Y. 
SPENCER 
BUFFALO 
OPTIC PROJECTION “ Detroit’ Laboratory Burner 
Principles, installation and use of the Mag:c Lantern, Opaque 
Lantern, Projection Microscope and Moving Picture Machine; 
700 pages, 400 figs. By Smion Henry Gaan, B.S., and 
Henry Pourtes Gaan, Po.D. Postpaid, $3.00. 
THE COMSTOCK PUBLISHING CO., Ithaca,N, Y. 
The New Science of the Fundamental Physics 
By W. W. STRONG, Ph.D. 
Includes chapters on the Goal of the New Physics, 
the Directed Elements, the Atomic Systems and 
Models, Disintegration and Radiation Theories, 
Elementarquanta, the Fundamental Units and Rel- 
ativity. 117 p. cloth. $1.25. 
S. I. E. M. CO., Mechanicsburg, Pa. 
Teachers Wanted 
We have a steady demand for men in all depart- The Standard Burner for Laboratory uses of every char™ 
r : A 5 acter—most economical to operate. 
ments of Science for Agricultural Colleges, and Uni- It produces a stiff, blue flame of maximum temperature, 
versities. Speeial terms. Address Tat use of Air Be fe A aan 
eparate control of both air and gas. Will not flash bac 
The Interstate Teachers’ Agency sone ae : 
Macheca Bidg. New Orleans, La. Guaranteed to work on any kind of gas—city coal gas, 
natural or gasoline-gas. 
In your next order specify the ““ DETROIT” and get the 
SCIENTIFIC LECTURER WANTED best. The name “DETROIT ” is stamped on the bamer= 
The museum wishes to employ a resident, male lecturer to | 100K out for imitations. Ask us for name of dealer in your 
ist i i i i vicinity, or order direct. 
et sais CR ST aarti atae asta Aah Prices: Less than doz. lots, $1.25 each; Lots of 1 doz. 10 per 
Requirements: good foundation in biologie and geologic | Cent. discount; Lots of 12 doz. 20 per cent. discount. 
subjects, lecturing ability, good voice and presence. 
Hen, ie $1,800, according to abilities and ex- DETROIT HE ATING & LIGHTING 
DIRECTOR, PUBLIC MUSEUM COMPANY 
MILWAUKEE, WIS. 612 Wight Street Established 1868 DETROIT, MICH. 
