SCIENCE 
NEw SERIES SINGLE COPIES, 15 CTs. 
VoL. XXXY. No. 912 Fripay, JUNE 21, 1912 ANNUAL SUBSCEIPTION, $5.00 
I. 
FA) 
: 
Barnstead Automatic Water Stills 
The most popular for laboratory purposes, and considered by many eminent 
chemists to be by far the most efficient on the market. 
The product of these apparatus represents the highest degree of purity ever 
reached by any process of distillation. 
The operation when once begun is thoroughly effective, automatic and con- 
tinuous ; removes ammonia and all gaseous and organic impurities, and renders 
water chemically pure. 
GAS HEATED, sizes from 4 to 10 gallons per hour 
STEAM HEATED, sizes from 5 to 75 gallons per hour 
The steam operated stills are considerably used for furnishing pure water, both 
for laboratory and drinking purposes; for the latter the stills can be equipped with 
a special arrangement for making the water thoroughly palatable. 
Write to-day for descriptive booklet “ Water Distilling Appara(us”’ 
EIMER & AMEND Establishea 1851) NEW YORK 
HEADQUARTERS FoR EpucatioNAL LABORATORY SUPPLIES 
