200 REPORT OF THE SECRETARY GENERAL. 



Solar activity, cyclonic storms, and climatic changes, by Ellsworth 



Huntington. 

 Som£ results of aerological observations, by W. R. Blair. 

 Temperature conditions at New Orleans, as influenced by sub-surface drainage, 



by Isaac M. Cline. 

 Tests sobre m^teorologia agricola, by Luis G. Tufino. 

 The Argentine Weather Service, by H. H. Clayton. 



The collection of earthquake data in the United States, by W. J. Humphreys. 

 The economic aspect of climatology, by Edward Lansing Wells. 

 The Ferrel doctrine of polar calms, and its disproof in recent observations, 



by Wm. M. Hobbs. 

 The meteorological influences of lakes, by Eric Rexford Miller. 

 The pieionian climatic fluctuations, by H. Arctowski. 

 The position of meteorology among the sciences, by Chas. F. Von Herrmann. 

 The principles involved in predicting high stages in flashy streams, with 



special reference to the scheme for the Savannah River at Au^sta, Ga., 



by Eugene D. Emigh. 

 The river service of the Weather Bureau, by Alfred J. Henry. 

 The thunderstorms of the United States as climatic phenomena, by Robert 



De C. Ward. 

 The weather and climate of Salt Lake City, Utah, by Alfred H. Thiessen. 

 Thunderstorms, by Wm. H. Alexander. 



Tropical rains; their duration, frequency, and intensity, by Oliver L. Fassig. 

 Wind velocity and elevations, by W. J. Humphreys. 



SECTION III. 



CONSERVATION OF NATURAL RESOURCES. 



SUBSECTION 1. 

 CONSERVATION OP MINERAL RESOURCES. 



Conservation and economic theory, by Richard T. Ely. 



Conservation in its relation to industrial evolution, by Ralph Henry Hess. 



Conservation of iron ore, by C. K. Leith. 



Conservation of metals by the recovery and use of scrap metals and drosses, 



by John P. Dunlop. 

 Conservation of the oil and gas resources of the Americas, by Ralph Arnold. 

 Conservation of the phosphate deposits of the United States, by W. C. Phalen. 

 Government control of minerals on public lands, by J. F. Callbreath. 

 Legal and economic factors in the conservation of oil and gas, by Roswell H. 



Johnson. 



