Exchanges. xxi 



United States — Continued. 

 Buffalo (N. Y.). 



Society of Natural Sciences. 

 Cambridge {Mass.). 



Entomological Club. 



Harvard College Library. 



Harvard College Observatory. 



Museum of Comparative Zoology. 



Peabody Museum of American Archaeology and 

 Ethnology. 

 Chapel Hill {N. C). 



Elisha Mitchell Scientific Society. 

 Charleston {S. C). 



Elliott Society of Science and Art. 

 Charlotteville ( Va.). 



University of Virginia Library. 

 Chicago {111.). 



Academy of Sciences. 



Field Columbian Museum. 



Historical Society. 



John Crerar Library. 



"The Monist." 



Public Library. 



University of Chicago Library. 

 Cincinnati (0.). 



Society of Natural History. 

 Cleveland (0.). 



Geological Society of America. 

 Columbia {Mo.). 



State University Library. 

 Columbus (0.). 



Ohio State University Library. 

 Davenport (7a.). 



Academy of Natural Sciences. 

 Denver {Col.). 



Colorado Scientific Society. 

 Des Moines (7a.). 



Iowa Academy of Science. 

 Geneva {N. Y.). 



Agricultural Experiment Station. 

 Golden {Col). 



State School of Mines. 



