LITERATURE 179 



54. . Phytogeography of Montana. Bull. Tor. 

 Bot. Club. 27:292-294. 1900. 



55. . Phytogepgraphical notes on the Rocky 

 Mountain region. Bull. Tor. Bot. Club. 40 : 677-686. D., 41 : 

 89-103. F., 459-474. S., 42: 11-25. Ja., 629-642. N., 43: 

 343-364. Jl. 1913-1916. 



56. SCHIMPER, A. F. W. Plant geography on a physiolog- 

 ical basis. English Translation. Oxford. 1903. 



57. SHAW, CHARLES H. Vegetation of the Selkirks, Bot. 

 Gaz. 61 : 477-494. Je 1916. 



58. SKINNER, M. P. The Nutcrackers of the Yellowstone 

 Park. The Condor. 18 : 62-64. 1916. 



59. SMILEY, F. J. The alpine and sub-alpine vegetation of 

 the Lake Tahoe region. Bot. Gaz. 59 : 256-286. f. 1-4. Ap 1915. 



60. SUDWORTH, GEORGE B. The pine trees of the Rocky 

 Mountain Region. Bull. IT. S. Dept. Agric. 460 : 1-47. pi. 1-25. 

 mp. 1-10. My 1917. 



61. . The spruce and balsam fir trees of the 

 Rocky Mountain region. TT. S. Dept. Agric. Bull. 327: 1-43. 

 pi. 1-25. mp. 1-10. F 1916. 



62. . Forest trees of the Pacific Slope. U. S. 

 D.ept. Agric. Forest Service. 1908. 



63. THWAITES, R, C. Maximilian's travels in N. America. 

 Early Western Travels, 1748-1846. 21 : 10-16. 22 : 384-385. 



64. TORREY, JOHN. Catalogue of the plants collected by 

 Mr. Charles Geyer, under the direction of Mr. I. N. Nicollet, 

 during his exploration of the region between the Mississippi 

 and the Missouri Rivers. Sen. Doc. 26th Cong. Washington. 

 1843. 



65. TRANSEAU, E. N. On the geographic distribution and 

 ecological relations of the bog plant societies of northern North 

 America. Bot. Gaz. 36 : 401-420. /. 1-3. D 1903. 



66. . The relation of plant societies to evap- 

 oration. Bot. Gaz. 45 : 217-231. Ap 1908. 



67. TURESSON, GOTE. Slope exposure as a factor in the dis- 

 tribution of Pseudotsuga taxi folia in arid parts of Washington. 

 Bull. Tor. Bot. Club. 41:337-345. Je 1914. 



68. VISHER, S. S. Report on the biology of Harding coun- 



