INDEX TO AMERICAN BOTANICAL LITERATURE 441 
Harms, H. Leguminosae americanae novae. VI. Repert. Sp. 
Nov. Regn. Veg. 19: 288-294. 20 F 1924. 
Including new species in Ormosia (2), Dussia (2) and new combinations 
Harris, J. A. The tissue fluids of Cuscuta. Bull. Torrey Club 
Sli 127-131. “Ap 17 My 1924. 
Hendricks, E., & Harvey, R. B. Growth of plants in artificial 
light II, Intensities of continuous light required for bloom- 
ing. Bot. Gaz. 77: 330-334. f. 1. 19 My 1924. 
Heinicke, A. J. Catalase activity in dormant apple twigs: 
its relation to the condition of the tissue, respiration, and 
other factors. N. Y. (Ithaca) Agr. Exp. Sta. Memoir 74: 
1-33. Mr 1924. 
Hitchcock, A.S. The North American species of Aristida. Contr. 
U.S. Nat. Herb, 22: i-viii + 517~586. 1924. 
Including descriptions of new species and subspecies. 
Hitchcock, A. S. The type specimen. Jour. Bot. 62: 166. Je 
1924. 
Hoehne, F. C. Campos do Jordao seu clima e sua phytophy- 
sionomia. Campos do Jordéo 1-37. Mr 1924.  [Illust.] 
Hollick, A. Swamps, ancient and modern. Jour. N. Y. Bot. 
Gard. 12: 145-147. My 1924. 
Holm, T. Apios tuberosa Moench. Am. Mid. Nat. 9: 118- 
136. pl. 7-9. My 1924. 
Howe, M. A. Chinese marine algae. Bull. Torrey Club 51: 
133-144. pl. r-2. “Ap” 17 My 1924. 
Howe, M. A. Starch-bearing plants. Jour. N. Y. Bot. Gard. 
25: 135-142. My 1924. 
Hurd, A. M. The course of acidity changes during the growth 
period of wheat with special reference to stem-rust resist- 
ance. Jour. Agr. Research 27: 725-735. 8 Mr 1924. 
Hutchinson, A. H. Embryogeny of Adies. Bot. Gaz. 77: 280- 
289. f. 1-3. pl. 17-20. 19 My 1924. 
