284 INDEX TO AMERICAN BOTANICAL LITERATURE 
Ness, H. Field experiments with crown gall, 1913-1917. Texas 
Agr. Exp. Sta. Bull. 211: 1-21. f. 1-7. I 
Olaya, R. M. La ciencia y el mana de los hebreos. Bol. Soc. Cien. 
Nat. Inst. La Salle 4: 42-46. Ap 1916. 
Osterhout, W. J. V. A comparison of permeability in plant and animal 
cells. Jour. Gen. Physiol. 1: 409-413. 20 Mr 1919. 
Osterhout, W. J. V. Decrease of permeability and antagonistic effects 
caused by bile salts. Jour. Gen. Physiol. 1: 405-408. f. r, 2. 20 
Mr 1919. 
Potts, A. T. The fig in Texas. Texas Agr. Exp. Sta. Bull. 208: 
I=qt. f. 1-13... Ja 1or7. 
Rigg, G. B. Early stage in bog succession. Publ. Puget Sound Biol. 
Sta. 2: 195-210. pl. 29, 30. 5 Mr 1919. 
Rosen, H. H. A preliminary note on a bacterial disease of fox tail. 
Science II. 49: 291. 21 Mr 1919. 
Rosendahl, H.V. Filices novae. Ark. Bot. 14!8; 1-5. gy I-3. 1916. 
Adiantum madagascariense, Asplenium Afzelii, Diplazium latisectum and Odon- 
tosoria, spp. nov., are described. 
Rydberg, P. A. A genus of plants intermediate between Petalostemon 
and eee Sodas N. Y. Bot. Gard. 20: 64-66. Mr 1919. 
Thornbera gen. nov. 
Sargent, C. S. ea on North American trees. IV. Bot. Gaz. 67: 
- 208-242. 18 Mrigrg. 
Populus Palmeri, P. texana, Betula Eastwoodae, spp. nov., and many new varieties 
are described. 
Schneider, C. Arbores fruticesque chinenses novi. IV. Bot. Gaz. 
64: 137-148. pl. 15. 15 Au 1917. 
Describes 8 new species in Salix and 1 in Alnus. 
Shive, J. W. Comparison of salt requirements for young and for 
mature buckwheat plants grown in sand cultures. New Jersey 
Agr. Exp. Sta. Ann. Rep. 38: 409-413. f. z. 1917. 
Shufeldt, R. W. Various parasitic plants; with an owl story. Am. 
Forestry 25: 937-941. f. 1-9. Mr 1919. 
Small, J. K. Ferns of Royal Palm Hammock. i-vii + 1-39. i. 1. 
New York. 1918. [Illust.]_ 
Small, J. K. Narrative of a cruise to Lake Okeechobee. Am. Mus. 
Jour. 18: 685-700. D 1918. [TIllust.] 
Small, J. K. The prickly-pears of Florida. Jour. N. Y. Bot. Gard. 
20; 21-39. pl. 224-226. F 1919. 
Includes Opuntia lata Small, O ammophila Small, O. keyensis Britton, and O. 
sebrina Small. 
