Exchanges. 



xxi 



United States — Continued. 

 Buffalo {N. T.). 



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 {III.). 



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 {la.). 



Iowa Academy of Science. 

 Geneva {N. T.). 



Agricultural Experiment Station. 

 Golden {Col.). 



State School of Mines. 



