LIST OF EXCHANGES. 
Ill 
RUSSIA. 
Finsk Vetenskaps-Societetens, Helsingfors, Finland, Russia. 
Societe Physico-Mathematique de Kasan, Kasan, Russia. 
SCOTLAND. 
The Royal Society of Edinburgh, Edinburgh, Scotland. 
SPAIN. 
El Progreso Matematico, Zaragoza, Spain. 
SWEDEN. 
The Geological Institute of Upsala, Sweden. 
Kongl. Vetenskaps Akademiens, Stockholm, Sweden. 
SWITZERLAND. 
Naturforschende Gesellschaft, Zurich, Switzerland. 
UNITED STATES. 
The Smithsonian Institute, Washington, D. C. 
The Bureau of Education, Washington, D. C. 
The Department of Agriculture, Washington, D. C. 
The Weather Bureau, Washington, D. C. 
The American Philosophical Society, Philadelphia, Pa. 
The American Mathematical Monthly, Kidder, Mo. 
The Franklin Institute, Philadelphia, Pa. 
The Academy of Natural Sciences, Philadelphia, Pa. 
The University of Pennsylvania, Philadelphia, Pa. 
New York Academy of Sciences, New York, N. Y. 
Rochester Academy of Science, Rochester, New York. 
The American Academy, Boston, Mass. 
The University of Virginia, Charlottesville, Va. 
Indiana Academy of Science, Brookville, Ind. 
Wisconsin Academy of Sciences, Arts, and Letters, Madison, Wis. 
Minnesota Academj^ of Natural Sciences, Minneapolis, Minn. 
Iowa Academy of Sciences, Ames, Iowa. 
Academy of Science, St. Louis, Mo. 
Kansas Academy of Science, Topeka, Kans. 
Colorado Scientific Society, Denver, Col. 
Colorado College Scientific Society, Colorado Springs, Col. 
The University of California, Berkeley, Cal. 
The Lick Observatory, San Francisco, Cal. 
Field Columbian Museum, Chicago, Ill. 
Missouri State Geological Survey, Jefferson City, Mo. 
