SCIENCE—ADVERTISEMENTS 
Spencer Microscopes 
Our entire output of Microscopes is 
temporarily taken by the Medical Divi- 
sions of the U. S. Government. We are 
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. 
UFFALG 
Gay 
FOR SALE 
Stereopticon, a Williams, Brown & Earle “‘ Associa- 
tion Lantern,” fitted for arc light, with large rheostat 
with three cut in switches, slide carriers, etc., and 
eight-foot aluminium screen. But little used. Price $35 
HENRY E. WHITE 
NORTHAMPTON, MASS. 
Cooking Class at the 
WANTED 
1 Vertical Illuminator for Opaque Microscopic Work, 
No. 1785 Bausch & Lomb Catalog, or similar L South Dakota State College 
Model B Bausch'& Lomb. Mechanical Stage. 1 4 
ner Micrometer to fit 23 mm. tube. Communicate are using gas made by 
wi 
WESTINGHOUSE LAMP COMPANY The “Detroit” 
CTE Neiy MERE Combination Gas Machine 
WA NT iD D for supplying gas in Departments of 
; giles ymestic Science 
As editor for scientific publications from re- Domestic Sc 
search laboratory, woman graduate with Chemistry and Physics 
knowledge of physics and chemistry. Per- (Over:30,000 in eR 7 
ti freee Laboratory work can be done better 
manent position offering good field to quicker and cheaper by using this gas, 
student of science having literary tastes. Ask for descriptive catalog and names 
of users in your vicinity. 
Detroit Heating & Lighting Co. 
Director, Research Laboratory 612 Wight St. Detroit, Mich. 
Eastman Kodak Company cn 
ROCHESTER, N. Y. 
Apply to the 
