Vol. VII, pp. 1-64 April, 1892 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



THE GEOGRAPHIC DISTRIBUTION OF LIFE IN 



NORTH AMERICA 



WITH SPECIAL REFERENCE TO THE MAMMALIA* 



BY C. HART MERRIAM, M. D. 



CONTENTS. 



Page 



Introductory Remarks 2 



Historical Synopsis of Fauna].an(l Floral Divisions proposed for North 



America f, 



Arctic Division (above limit of trees) 8 



Boreal Division 9 



Atlantic, Central, and Pacific Divisions of Temperate North 



A merica K) 



Atlantic or Eastern Forest Division 11 



Central or Middle Division 12 



Pacific or Californian Division i;^ 



Austroriparian or Louisianian Division 14 



Sonoran Division 15 



Peninsula of Lower California IG 



Southern Florida 17 



Antillean Division 18 



Northwest Coast Division 20 



Prairie Division 20 



Recapitulation 21 



Life Regions and Zones of North America (as here recognized) 21 



* Annual Presidential Address, delivered at the Twelfth Annivei'sary 

 Meeting of the Biological Society of Washington, February (>, 18!)2. 



1— Biol. Snr., Wash., Vol. VII, 18',)2. (1) 



