INDEX TO AMERICAN BOTANICAL LITERATURE 509 
Shear, C. L., & Stevens, N. E. Plant pathology today. Sci. Mo. 7: 
235-243. $1918. 
Shear, C. L., Stevens, N. E., Wilcox, R. B., & Rudolph, B. A. Spoilage 
of cranberries after harvest. U. S. Dept. Agr. Bull. 714: 1-20. 
9g Au 1918. 
Shufeldt, R. W. Midsummer flower-hunts. Am. Forestry 24: 489- 
496. f. 1-10. Au 1918. 
Sinnott, E. W. Factors determining character and distribution of food 
reserve in woody plants. Bot. Gaz. 66: 162-175. Jody 22015 AU 
1918. 
Skottsberg, C. The islands of Juan Fernandez. Geog. Rev. 5: 362- 
383. f. 1-20. My 1918. 
Soth, B. H. Blossoms by the wayside in the Rockies. Am. Bot. 24: 
88-91. Au 1918. [Illust.] 
Spegazzini, A. Observaciones microbiolégicas. An. Soc. Cien. Argen- 
tina 85: 311-323. Je 1918. 
Includes the new genera Amphoropsis, Myriapodophila, Thaxteriola, Entomo- 
cosma, and several new species in the Laboulbiniales, and two new species in Chan- 
transiopsis. 
Stevens, N. E. American botany and the great war. Science II. 48: 
177-179. 23 Au 1918. 
Stevenson, J. A. Citrus diseases of Porto Rico. Jour. Dept. Agr. 
Porto Rico 2: 43-123. Ap 1918. 
Stone, R. E. Incubation period of Cronartium ribicola on the white 
pine. Phytopathology 8: 438-440. Au 1918. 
Sudworth, G.B. Miscellaneous conifers of the Rocky Mountain region. 
U.S. Dept. Agr. Bull. 680: I-45. pl. 1-13 +maps 1-9. 14 Au 1918. 
Thériot, I. Note sur une mousse du Chili, Barbula flagellaris Schp. 
Rec. Publ. Soc. Havraise d’Etudes Div. (1er Trimestre 1917), pp. 
I-7. 1917. 
Turner, C. E. Plant and animal life in the purification of a polluted 
stream. Sci. Mo. 7: 34-45- Jl 1918. [Illust.] 
Veitch, F. P., & Rogers, J. S. American sumac: a valuable tanning 
material and dyestuff. U.S. Dept. Agr. Bull. 706: 1-12. pl. 1-5. 
26 Jl 1918. 
Weatherwax, P. The evolution of maize. 
309-342. f. I-36. 9 S 1918. . 
Weir, J. R., & Hubert, E.E. Cultures with Melampsorae on Populus. 
Mycologia 8: 194-198. Jl 1918. 
Bull. Torrey Club 45: 
