List of Exchanges. 
Colorado Springs, Colo. 
1. Colorado College Scientific Society. 
Columbus, O. 
1. Geological Survey of Ohio. 
2. Ohio State University. 
Davenport, la. 
1. Davenport Academy of Natural Science. 
Denver, Colo. 
1. The Colorado Scientific Society. 
Des Moines, la. 
1. Iowa Academy of Sciences. 
Duluth, Minn. 
1. Historical and Scientific Association. 
Evanston, Ill. 
1. Northwestern University. 
Granville, O. 
1. Journal of Comparative Neurology. 
2. Denison University. 
Harrisburg, Penn. 
1. Geological Survey of Pennsylvania. 
Indianapolis, Ind. 
1. Geological Survey of Indiana. 
2. Indiana Academy of Science. 
Iowa City, la. 
State University of Iowa, Natural History Laboratory. 
Ithaca, NT. Y. 
1. Cornell University. 
Jefferson City, Mo. 
1. Geological Survey of Missouri. 
Kansas City, Mo. 
1. Kansas City Review of Science and Industry. 
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