90 INDEX TO AMERICAN BOTANICAL LITERATURE 
Gates,R.R. The mutation theory and the species concept. Am. Nat: 
51: 577-595: O 1917. 
Gleason, H. A. Some effects of excessive heat in northern Michigan. 
Torreya 17: 176-178. 31 0.1917. 
Gleason, H. A. The structure and development of the plant associa- 
tion. Bull. Torrey Club 44: 463-481. 1 O 1917. 
Grantham, A. E. The tillering of wheat. Sicence II. 46. 392, 393. 
19 O 1917. 
Gravatt, G. F., & Marshall, R. P. Arthropods and gasteropods as 
carriers of Cronartium ribicola in greenhouses. Phytopathology 7: 
368-373. 30 1917. 
Gregory, W. K. Genetics versus paleontology. Am. Nat. 51: 624- 
635s. O 19t7. 
Grossenbacher, J. G. Crown-rot of fruit trees: histological studies. 
m. Jour. Bot..4: 477-512. pl. 21-27. O 1917. 
[Grosvenor, G. H.] Our state flowers. The floral emblems chosen by 
the commonwealth. Nat. Geog. Mag. 31: 481-517. Je 191 
917. 
Each state flower is illustrated in color from the original paintings by Miss 
M. E. Eaton, of the N. Y. Bot. Garden. 
Guilliermond, A. Levaduras del pulque. Bol. Direc. Estud. Biol. 
Mexico 2: 22-28. Ja 1917. 
Illustrated with numerous figures. 
Giissow, H. T. Plant diseases in Canada. Science II. 46: 362. 12 
O I917. 
A report on the presence of Dothichiza Populea, Colletotrichum cereale, and 
Sporidesmium exitiosum. 
Harper, R.M. A preliminary soi! census of Alabama and west Florida. 
Soil Sci. 4: 91-107. Au 1917. 
Harper, R. M. The native plant population of northern Queens 
County, Long Island. Torreya 17: 131-142. 14 Au 1917. 
Harris, J. A. The weight of seeds as related to their number and posi- 
tion. Torreya 17: 180-182. 31 O 1917. 
Harris, J. A., & Lawrence, J. V. Cryoscopic Wererinionticies on tissue 
fluids of plants of Jamaica coastal deserts. Bot. Gaz. 64: 285-305. 
16 O 1917. 
Harshberger, J. W. Pennsylvania men commemorated in the names 
of plants. Alumni register 1917: pp. 3. Ap 1917. [Illust.] 
A reprint without pagination. 
Harshberger, J. W. A text book of mycology and plant pathology. 
i-xili + 1-779. f. 1-270. Philadelphia. 1917. 
