544 INDEX TO AMERICAN BOTANICAL LITERATURE 
Pritchard, F. J. Correlations between morphological characters and 
the saccharine content of sugar beet. Am. Jour. Bot. 3: 361-376. 
f. 1-8 Au 1916. 
Ramaley, F. Quadrat studies in a mountain grassland. Bot. Gaz. 
62: 70-74. 15 Jl 1916. 
Reed, G. B. On the mechanism of oxidase action. Bot. Gaz. 62: 
53-64. f. I-4. 15 Jl 1g16. 
Reed, G. B. The powdery mildews of Avena and Triticum. Missouri 
Agr. Exp. Sta. Research Bull. 23: I-19. Je 1916. 
Rock, J. F. A new species of Pritchardia. Bull. Torrey Club 43: 
385-387. pl. 21 +f. 1. 12 Au 1916. 
Pritchardia Beccariana Rock. 
Rose, J. N. Echeveria cornicolor. Flesh-colored Echeveria. Addi- 
sonia 1: 25. pl. 13. 30 Je 1916. 
Rosen, H.R. The development of Phylloxera vestatrix leaf gall. Am. 
Jour. Bot. 3: 337-360. l. 4, 15 +f. 1-5. . Aw.1916. 
Rumbold, C. Pathological anatomy of the injected trunks of chestnut 
trees. Proc. Am. Philos. Soc. 55: 485-493. pl. 15-18. 10 Jl 1916. 
Rydberg, P. A. Phytogeographical notes on the Rocky Mountain 
region—VI. Distribution of the subalpine plants. Bull. Torrey 
Club 43: 343-364. 22 Au 1916. 
Saccardo, P. Notae mycologicae, Series XX. Nuovo Giorn. Bot: 
Ital. 23: 185-234. Ap 1916 
Includes Meliola pitya, Chorostate Peckiana, Hypoderma tenellum, Phaeangium 
Peckianum, spp. nov., and Microascus americanus gen. et sp. nov 
Saunders, E. R. On selective partial sterility as an explanation of 
the behavior of the double-throwing stock and the Petunia. Am- 
Nat. 50: 486-498. Au 1916. 
Seaver, F. J. Borers infesting the ash. Jour. N. Y. Bot. Gard. 17: 
95-97. pl. 173, 174. Jl 1916. 
Shull, C. A. Measurement of the surf 
ace forces in soils. Bot. Gaz. 
62: 1-31. f. 1-5. 15 Jl 1916, | 
Sinnott, E. W. Comparative rapidity of evolution in various plant 
types. Am. Nat. 50: 466-478. Au 1916. 
Smith, E. F. Further evidence as to the relation between crown gall 
and cancer. Proc. Nat. Acad. Sci. 2: 444-448. Au 1916. 
