No. 468.] AMERIGAN FOREST CENTERS. 889 
SARGENT, C. S. 
'91— 02. The Silva of North America. Houghton, Mifflin & Co., 
Boston. 
SARGENT, C. S. 
:05. Manual of the Trees of North America. Houghton, Mifflin & 
Co., Boston. 
SAUNDERS, D. A. 
'99. Ferns and Flowering Plants of South Dakota. .S. Dak. Agric. 
Exper. Sta., bull. 64. 
SCHIMPER, A. F. W. 
:03. Plant Geography upon a Physiological Basis. Translation by W. 
R. Fisher, Oxford. 
SMALL, J. K. 
:03. Flora of the Southeastern United States. Pub. by the author, 
New York. 
SUDWORTH, G. B 
‚98. Checklist of the Forest Trees of the United States. Div. of For- 
estry, U. S. Dept. Agric., bull. 17. 
TRANSEAU, E. N. 
:03. On the Geographical Distribution and Ecological Relations of the 
Bog-plant Societies of Northern North America. Bot. Gaz., vol. 
36, p. 401. 
VASEY, G. 
! The Distribution of North American Forest Trees. U. S. Deft. 
of Agric., spec. rep. no. 5, p. 38. 
WEATHER BUREAU, U. S. , 
:04. The Record of Weather in the United States. The American 
Almanac, p. 77- 
WHITFORD, H. N. 
:01. The Genetic Development of the Forests of Northern Michigan. 
Bot. Gaz., vol. 31, p. 315. 
