428 INDEX TO AMERICAN BOTANICAL LITERATURE 
Gaskill, A. A shade tree guide. Rep. Dept. Conserv. & Develop. 
New Jersey 1-22. f. 1-13. Union Hill. My 1918. 
Gates,R.R. A systematic study of the North American Melanthaceae 
from the genetic standpoint. Jour. Linnean Soc. 44: 131-172. 
pl.5. 22 My 1918. 
Gillespie, L. J. The growth of the potato scab organism at various 
hydrogen ion concentrations as related to the comparative freedom 
of acid soils from the potato scab. Phytopathology 8: 257-269. 
fide VS GE vei8. 
Glaser, R. W. A new bacterial disease of gipsy-moth caterpillars. 
Jour. Agr. Research 13: 515-522. i. 54. 3Je1918. 
Gilbert, W. W., & Gardner, M.W. Seed treatment control and over- 
wintering of cucumber angular leaf-spot. Phytopathology 8: 229- 
233. My 1918. 
Goodale, G. L. The development of botany as shown in this journal. 
Am. Jour. Sci. 46: 399-416. Jl 1918. . 
Hance, R. T. Variations in the number of somatic chromosomes in 
Oenothera scintillans DeVries. Genetics 3: 225-275. ol. 1-7 + 
f. I-35. My 1918. 
Harlan, H. V. Cultivation and utilization of barley. U. S. Dept- 
Agr. Farm. Bull. 968: 1-39. f. z-ro. Je 1918, 
Heinicke, A. J. Factors influencing the abscission of fowers and par- 
tially developed fruits of the apple. Proc. Am. Soc. Hort. Sci. 
1916: 95-103. Mr 1917. 
Hitchcock, A. S. Generic types with special reference to the grasses 
of the United States. Am. Jour. Bot. 5: 248-253. 21 Je 1918. 
Hood, G. W. Inheritance in tomatoes. 
88-95. F 1916. 
Howe, M. A. Further notes on the structural dimorphism of sexual 
and tetrasporic plants in the genus Galaxaura. Brooklyn Bot. 
Gard. Mem. 1: 191-197. pl. 3,4+f. 1-4. 6Jl 1918. 
Jones, D. F. Segregation of susceptibility to parasitism in maize. 
Am. Jour. Bot. 5: 295-300. 6 Jl 1918. 
Jones, L. R., & Gilbert, W. W. Lightning injury to herbaceous plants. 
Phytopathology 8: 270-282. f. #3. 25 Vi tors. 
Judd, C.S. The true mahogany tree. Hawaiian Forest. & Agr. 15: 
105. Ap 1918.  [Illust.] 
Keitt, G. W. Inoculation experiments with species of Coccomyces 
from stone fruits. Jour. Agr. Research 13: 539-570. pl. 55-59 + 
f. t3.. 10 Je 1018. 
Proc. Soc. Hort. Sci. 1915: 
