INDEX TO AMERICAN BOTANICAL LITERATURE 35 
Osterhout, W. J. V. The nucleus as a center of oxidation. Brooklyn 
Bot. Gard. Mem. 1: 342-347. 6 Jl 1918. 
Osterhout, W. J. V., & Haas, A. R. C. On the dynamics of photo- 
synthesis. Jour. Gen. Physiol. 1: 1-16. f. 1-5. S 1918. 
Packard, C. Difference in the action of radium on green plants in the 
presence and absence of light. Jour. Gen. Physiol. 1: 37, 38. 
1918. 
Pearson, G. A. The relation between spring precipitation and height 
growth of western yellow-pine saplings in Arizona, Jour. Forestry 
16: 677-689. f. 1-3. O 1918. 
Peltier, G. L.. & Neal, D. C. Overwintering of the Citrus-canker 
organism in the bark tissue of hardy Citrus hybrids. Jour. Agr. 
Research 14: 523, 524. pl. 58. 9 S 1918. 
Pierce, R.G. Additional list of state and national quarantines against 
the white pine blister rust. Phytopathology 8: 484-486. 12S 1918. 
Piper, C. V., & Beattie, R. K. Floraof the northwest coast. i-iv + 
1-418. Lancaster. 1915. f 
Piper, C. V., & Beattie, R. K. Flora of southeastern Washington and 
adjacent Idaho. i-xi+ 1-296. Lancaster. 1914. 
Pring, G. H. Cycads. Jour. Internat. Gard. Club 2: 365-377. S 
1918. [Illust.] 
Rathbun, A. E. The fungous flora of pine seed beds. Phytopathol- 
ogy 8: 469-483. 12S 1918. 
Reed, G. M. Physiological specialization of parasitic fungi. Brook- 
- lyn Bot. Gard. Mem. 1: 348-409. 6 Jl 1918. 
Reeves, F.S. An investigation in tomato breeding. Proc. Soc. Hort. 
Sci. 1914: 24-26. Mr 1915. 
Riddle, L. W. Lichens of St. Thomas. In Britton, N. L. The flora 
of the American Virgin Islands. Brooklyn Bot. Gard. Mem. 1: 
109-15. J. 3: .G JL 1918. 
Opegrapha acicularis, Lecania euthallina, and Blastenia nigrocincta, spp. nov., 
are described. 
Rolfe, R. A. Gongora latisepala. Curt. Bot. Mag. IV. 14: pl. 8766. 
S 1918. 
A plant from Colombia. 
Rolfe, R. A. Govenia tingens. Curt. Bot. Mag. IV. 14: pl. 8768. 
S 1918. 
A plant from Peru. ‘ 
[Rolfe, R. A.] Orchids of Panama. Orchid Rev. 26: 179-181. Au 
1918. 2 
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