90 THE UNITED STATES GEOLOGICAL SURVEY. [btjll.227. 
Cooperative relations were arranged also with the hoards of health 
of Minnesota and Ohio. In the former case an agreement was entered 
into between the State board of health and the University of Minnesota 
and the Geological Survey, whereby certain work was to be performed 
and paid for by appropriations agreed upon. It is the purpose of 
those in charge of the division to make arrangements of this character 
in all possible cases. 
When it was proposed to devise methods for water analysis those in 
charge of the chemical departments of the important railroads of the 
country were asked to submit their ideas on the subject, as well as the 
results of experience gained in their various laboratories. In this 
way there was brought together a large amount of valuable information 
which has been used in devising these methods. Among the roads 
which have been of assistance in this way are the Pennsylvania Kail- 
road, Lake Shore and Michigan Southern, Chicago and Northwestern, 
Milwaukee and St. Paul, Atchison, Topeka and Santa Fe, Union 
Pacific, Baltimore and Ohio, Norfolk and Western, Philadelphia and 
Reading, New York Central and Hudson River. 
The work of the division of Irydro-economics, although recently 
established, has already afforded practical results. Among the most 
important of these are: 
Determinations of sources of water suitable for industrial and boiler 
purposes in West Virginia," western Pennsylvania, and southeastern 
Ohio. 
Character of water supplies of southeastern Kansas. 
A chemical survey of waters in Florida, with special reference to i 
their suitability for use in steam boilers. 
Sulphite wood-pulp waste; its damage to natural waters and thej 
prevention thereof on Androscoggin River, Maine. 
Coal-mine wastes; their character and value and their effect upon 
the waters of Susquehanna and Lehigh rivers, Pennsylvania. 
Straw-board waste in Indiana and Ohio; its damage to water 
resources, the prevention thereof, and its profitable recovery. 
Character of waters in Minnesota and Iowa, with special reference 
to the possibility of their being used as city supplies. 
Determination of alkaline and saline constituents in waters of the. 
arid States which it is proposed to conserve for irrigation purposes.! 
Character of normal waters in Kentucky and their value in mimic- 1 
ipal and industrial lines. 
Interstate pollution of Hoosic River, in Vermont, Massachusetts, 
and New York, and the damage caused thereby to riparian owners in 
New York. 
For publications on hydro-economic subjects see the Survey's list of 
publications. 
