INDEX TO AMERICAN BOTANICAL LITERATURE 167 
Shimek, B. An artificial prairie. Bull. Lab. Nat. Hist. Univ. lowa 6: 
35-42: pl. r. 26 Ap 1913. 
Shive, J. W. An improved non-absorbing porous cup atmometer. 
Plant World 18: 7-10. f. 1. Ja 1915. 
Shreve, E.B. An investigation of the causes of autonomic movements 
in succulent plants. Plant World 18: 297-312. f. 1-6. N 1915; 
331-343. f. 7-10. D 1915. 
Simmons, H. G. A survey of the phytogeography of the arctic 
American archipelago, with some notes about its exploration. 
Lunds Univ. Arsskrift II. 919: 1-183. Map I, 2. 1913. 
Skinner, J. J. The antizymotic action of a harmful soil constituent 
salicylic aldehyde and mannite. Plant World 18: 162-167. Je 
IQI5. 
Skinner, J. J. Effect of vanillin as a soil constituent. Plant World 
18: 321-330. f. 1-5. D 1915. 
Skottsberg, C. Notes on the relations between the floras of sub- 
antarctic America and New Zealand. Plant World 18: 129-142. 
My tgs. 
Slosson, M. Notes on Trichomanes—l. The identity of Trichomanes 
pyxidiferum L. Bull. Torrey Club 42: 651-658. pl. 30, 31. 22 Ja 
IQI5. 
Smith, E. F., & Bryan, M.K. Angular leaf-spot of cucumbers. Jour. 
Agr. Research 5: 465-476. pl. 43-49. 13 D 1915. 
Stakman, E.C. Spore germinations of cereal smuts. Minnesota Agr. 
Exp. Sta. Bull. 133: 1-52. pl. 1-25. Jl 1913- 
Standley, P. C. Vegetation of the Brazos Canyon, New Mexico. 
Plant World 18: 179-191. f. 1-3. Jl 1915. 
Standley, P. C. The genus Espeletia. Am. Jour. Bot. 2: 468-486. 
bl. 17+f. 1-6. 16 D 1915. 
Includes descriptions of 6 new species. 
Stapf, O. Jris bracteata. Curt. Bot. Mag. IV. 11: pl. 8640. D 1915. 
A plant from Oregon. 
Starr, A.M. A Mexican Aytonia. Bot. Gaz. 61: 48-58. pl. 1-4 + f. 
J0~33., 15:40 1016. 
Sterrett, W. D. The ashes: their characteristics and manag 
U.S. Dept. Agr. Bull. 299: 1-88. Pl. 1-16. 13 D 1915. 
Stewart, A. Further observations on the origin of the Galapagos 
Islands. Plant World 18: 192-200. Jl 1915- 
ement. 
