INDEX TO AMERICAN BOTANICAL LITERATURE 259 
Thommen. G. Notes on the fern leaf industry. Am, Fern 
Jour. 12: 122-125. 30 D 1922. 
Thompson, H. C., & Beattie, J. H. Group classification and 
varietal descriptions of American varieties of sweet potatoes. 
U.S. Dept. Agr. Bull. 1021: 1-30. pl. 1-8. 17 Ap 1922. 
Thompson, J. M. Studies on floral morphology—II. The 
staminal zygomorphy of Cowroupita guianensis Aubl. Trans. 
Roy. Soc. Edinburgh 53: 1-15. pl. 1-5 +f. I-3. 1922. 
Thone, F. Ecological factors in region of Starved Rock, 
Illinois. Bot. Gaz. 74: 345-368. f. 1-5. 21 D 1922. 
Tiffany, L. H. Some algal statistics ee sheng the gizzard 
shad. Science II. 56: 285, 286. 
Tisdale, W. H. Seedling blight and stack-burn of rice and the 
hot-water seed treatment. U. S. Dept. Agr. Bull. 1116: 
I-11. pl. 1-6 +f. 1,2. 13 N-1922. 
Torrend, C. Les Polyporacées du Brésil (cont.).Broteria 
Bot. 20: 107-112. 1922. 
Tucker, E. M. Bibliographical notes. Jour. Arnold Arb. 3: 
227-231. D 1922. 
Turner, T. W. Studies of the mechanism of the physical 
effects of certain mineral salts in altering the ratio of top 
growth to root growth in seed plants. Am. Jour. Bot. 9: 
415-445. 200 1922. 
Uphof, J. C. T. Der Anbau und Verkauf von Citrusobst in 
den Vereinigten Staaten. Tropenpflanzer 25: 72-83. Je 
1922. 
oe J. C. T. Der Loquat (Eriobotrya japonica) in den 
tenStaaten. Tropenpflanzer 25: 41-43. Ap 1922. 
Uphof, J. C. T. Vegetationsbilder aus Kalifornien. Vegetat- 
tionsbilder XIV. 7: pl. 37-42, with text. 1922. 
Urban, I. Plantae haitienses novae vel rariores a cl. Er. L. 
Ekman 1917 lectae. Arkiv Bot. 177: 1-72. 15 My 1922. 
Includes 2 new genera and 59 new species. 
