SCIENCE—ADVERTISEMENTS 
WANTED 
For position in pharmacological laboratory, woman, or man 
not subject to draft, with a thorough training in pharmacology, 
laboiatoiy physiology, zoology or general biology, who is 
capable of doing reseaich work. In replying, kindly give de- 
tails as to training, experience and initial salary expected. 
Unusual opportunity for persons meeting these qualifications. 
Address, Pharmaceutical Laboratory, in care of Science. 
Garrison, N. Y. 
Teachers Wanted 
We have a steady demand for men in all depart- 
ments of Science for Agricultural Colleges, and Uni- 
versities. Special terms. Address 
The Interstate Teachers’ Agency 
Macheca Bldg. New Orleans, La. 
SCIENTIFIC LECTURER WANTED 
The museum wishes to employ a resident, male lecturer to 
assist in the work of its education department with schools and 
general public. 
Requirements: good foundation in biologic and geologic 
subjects, lecturing ability, good voice and presence. 
Salary, $1,600 to $1,800, according to abilities and ex- 
perience. Address 
DIRECTOR, PUBLIC MUSEUM 
MILWAUKEE, WIS. 
The New Science of the Fundamental Physics 
By W. W. STRONG, Ph.D. y 
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. 
Published June 8 
CIVIC BIOLOGY 
By 
Clifton F. Hodge, The University of Ore- 
gon, and Jean Dawson, Board of 
Health, Cleveland 
As its title indicates, the purpose of 
this book is to present a thorough expla- 
nation of all the biological forces, both 
helpful and injurious, that profoundly 
affect community life and to show how, 
by united effort, the undesirable elements 
can be discouraged or exterminated, and 
how the beneficial can be fostered and 
. preserved. 
881 pages, fully illustrated, $1.50 
Ginn and Company 
Boston New York 
Atlanta Dallas 
Chicago London 
Columbus San Francisco 
The Theory 
of the 
Relativity of Motion 
By RICHARD CHACE TOLMAN 
Professor of Chemistry, University of Illinois 
This book presents an introduction to the Theory 
of the Relativity of Motion, a theory which in the 
decade since the publicat‘on of Binstein’s first 
paper has become a necessary part of the theoret- 
ical equipment of every physicist. The method of 
treatment adopted is to a considerable extent orig- 
inal and part of the material itself appears here for 
the first time. Professor Tolman aims not only to 
introduce the study of the relativity theory to 
those previously unfamiliar with it but also to pro- 
vide the necessary methodological equipment for 
those who. wish to pursue the theory in its more 
complicated applications. 
225 pages: paper, $£.50, cloth, $1.75 
Carriage extra 
The University of California Press 
Berkeley, California 280 Madison Ave., New York 
Giolang Class at the 
South Dakota State College 
are using gas made by 
The “Detroit” 
Combination Gas Machine 
for supplying gas in Departments of 
Domestic Science 
Chemistry and Physics 
(Over 30,000 in daily =se) 
Laboratory work can be done better, 
quicker and cheaper by using this gas. 
Ask for descriptive catalog and names 
of users in your vicinity. 
Detroit Heating & Lighting Co. 
612 Wight St. Detroit, Mich. 
Est. 1868 
