INDEX TO AMERICAN BOTANICAL LITERATURE 33 
Giissow, H. T. Drouth injury to McIntosh apple. Phytopathology 
8: 490, 491. f. r. 12S 1918. 
Giissow, H. T. Observations on obscure potato troubles. Phyto- 
pathology 8: 491-495. f. 2-5. 12 S$ 1918. 
Harper, E. T. Hvypholoma aggregatum and H. delineatum. Myco- 
logia 10: 231-234. pl. r2. 255 1918. 
Harper, R. A. Binary fission and surface tension in the development 
of the colony in Volvox. Brooklyn Bot. Gard. Mem. 1: 154-166. 
pl. 2+ f. 1-4. 6 Jl 1918. 
Harper, R. A. Organization, reproduction and inheritance in Pedi- 
astrum. Proc. Am. Philos. Soc. 837: 375-439. pl. 5, 6+ f. 1-35. § 
1918. 
Harris, J. A. Further studies on the interrelationship of morphologi- 
cal and physiological characters in seedlings of Phaseolus. Brook- 
lyn Bot. Gard. Mem. 1: 167-174. 6 Jl 1918. 
Harris, J. A. The interrelationship of the number of stamens and 
pistils in the flowers of Ficaria. Biol. Bull. 34: 7-17. 1918. 
Harshberger, J. W. American heaths and pine heaths. Brooklyn 
Bot. Gard. Mem. 1: 175-186. f. 1-8. 6 Jl 1918. 
Hollick, A. Some botanical problems that paleobotany has helped to 
solve. Brooklyn Bot. Gard. Mem. 1: 187-190. 6 Jl 1918. 
Hottes, A.C. Nature’s garden across southern Canada. Jour. Inter- 
nat. Gard. Club 2: 338-351. $1918.  [Illust.] 
Howe, M.A. Algae. In Britton, N. L. The flora of the American 
Virgin Islands. Brooklyn Bot. Gard. Mem. 1: 116,117. 6 Ji 1918. 
Hubert, E. E. Fungi as contributory causes of windfall in the north- 
west. Jour. Forestry 16: 696-714. O 1918. 
Jeffrey, E. C. Evolution by hybridization. Brooklyn Bot. Gard. 
Mem. 1: 298-305. pl. 5. 6 Jl 1918. 
Jennings, O. E. An annotated list of the Pteridophytes of northwest- 
ern Ontario—II. Am. Fern Jour. 8: 76-88. S 1918. 
Kryshtofovich, A. N. On the Cretaceous age of the ‘Miocene Flora” 
of Sakhalin. Am. Jour. Sci. 46: 502-510. S 1918. 
Kunkel, L.O. A method of obtaining abundant sporulation in cultures 
of Macrosporium Solani E. & M. Brooklyn Bot. Gard. Mem. 1: 
306-312. f. 1-4. 6 Jl 1918. 
Lankester, C. H. Lycastes in Costa Rica. Orchid Rev. 26: 181. Au 
1918. 
