Boe. INDEX TO AMERICAN BOTANICAL LITERATURE 
Gilbert, A. W. Suggestive laboratory exercises for a course in plant 
breeding. Am. Breed. Mag. 2: 196-212. f. 1-5. S IQII. 
Gorham, F. P. Some biochemical problems in bacteriology. Science 
II. 35: 357-362. 8 Mr 1912. 
Greene, E.L. Accessions to Apocynum. Leaflets 2: 165-189. 13 Mr 
Describes 42 new species in A pocynum. 
Greene, E. L. New species of Trautvetteria. Leaflets 2: 190-193. 
13 Mr 1912. 
Includes descriptions of 6 new species. 
Greene, E. L. Some Erigeron segregates. Leaflets 2: 193-196. 13 
Mr 1912, 
Grout, A. J. Mosses as a factor in land conservation. Bryologist 15: 
37~  Mr- 1912. ; 
Giissow, H.T. Preliminary note on “ silver leaf ” disease of fruit trees. 
Phytopathology 1: 177-179. pl. 25. -L) Aght. 
» H. M. New and noteworthy Californian plants—I. Univ. 
Calif. Publ. Bot. 4: 195-208. 8 Mr 1912. [Illust.] 
Includes several new varieties and combinations. 
Halsted, B. D. Geometrical figures in plant breeding. Am. Breed. 
Mag. 2: 217-220. f. 1,2. § IQIt. 
Harding, H. A. The constancy of certain physiological characters in 
the classification of bacteria. N. Y, Agr. Exp. Sta. Tech. Bull. 
13: 3-41. Je 1910. 
Harris, J. A. Observations on the physiology of seed development it 
Staphylea. Beih. Bot. Centralb. 28: 1-16. 25 Ja 1912. 
Hartley, C. P., Brown, E. B., Kyle, C. H., & Zook, L. L. Crossbreeding 
corn. U.S. Dept. Agr. Plant Ind. Bull. 218: 5-72. 17 F 1912. 
Hartz, N., & Kruuse, C. The vegetation of Northeast Greenland 
69° 25’ lat..N.—75° lat. N. Meddelelser om Grénland 30: 335-43" 
JOr-282 151. ; 
Hawkins, L.A. The effect of certain chlorides, singly and combined in 
pairs, on the activity of malt diastase. Johns Hopkins Univ. Cire. 
1912: 144, 145. F 1912. (Preliminary abstract.) ; 
Heald, F. D. Notes on new or little-known plant diseases in North 
America for the year 1910. Phytopathology 2: 5-22. F 1912 
Howe, R.H. Further notes on the North American distribution of the 
genus Usnea. Bryologist 15: 29, 30. Mr 1912. I 
Jessen, K. The structure and biology of arctic flowering plants’ 
Ranunculaceae. Meddelelser om Grénland 36: 335-440: f 56 
1911, 
