i SCIENCE—ADVERTISEMENTS 
STOKES AUTOMATIC WATER STILL 
FOR HEATING BY GAS 
The distinctive feature of this Still is that, by a patented con- 
struction, it utilizes the steam generated for heating the feed 
water to the boiling point, so that a minimum of heat is required 
to operate it, and by this preliminary heating of the feed water 
the ammonia and other gases are released and driven off, thus pro- 
ducing a water free from all impurities. 
The apparatus is 18 inches high and is heated by a bunsen 
burner which consumes 6 cubic feet of gas per hour. The water 
and gas are attached by means of rubber tubing, no pipe fittings 
being required. 
Capacity, 24 gallon per hour. 
$18.00, net 
Descriptive circular upon request, also circular describing Stokes 
Automatic Steam Stills of from 5 to 60 gallons 
per hour capacities 
ARTHUR H. THOMAS COMPANY 
IMPORTERS AND DEALERS 
MICROSCOPES, LABORATORY APPARATUS AND CHEMICALS 
1200 WALNUT STREET, PHILADELPHIA 
“KINO-SCIENCE” 
is an exceedingly interesting treatise on 
the inestimable value of 
Kinograms 
(Motion Pictures) 
taken and rendered by the 
Ernon Kino Camera 
Motion Picture Camera. Pocket Size. 
This camera takes, prints and projects 
Price within reach of eben the 
smallest school 
< 
we = es — - ea é 
ERNON KINO-APPARATUS 
(Motion Picture Camera) for microscopic work Booklet on request 
THE ERNON CAMERA SHOP 
18 West 27th St. NEW YORK 
Importers and Dealers of ERNEMANN CAMERAS 
the highest grade made 
