379 
Comparison of harvests, 362-363. 
Compensation, theory of, 219. 
Composition of crops, 18. i 
Conjugate thermometers, 81-89, 97, 288. 
Constant, solar, 91. 
Constants, phenological, 168, 189-191, 223-226, 239, 
uncertainty of, 229. 
Corn. See Maize. 
prize crops, 164. 
Cornell University, germination experiments, 37. | 
Corvallis, Oregon, soil temperatures, 62. 
Cotton, 303-306. 
Coutagne, phenological formula, 178-179. | 
Cracow, Austria-Hungary, fixation of nitrogen, 
154. 
Crops and fertilizers, 162-166. 
water and, 116. 
weather and, 247-251. 
Cultivation and evaporation, 108. 
crops, 331, 355-358. 
prize crop, 165. 
soil moisture and drainage, 114, 115. 
Cuminum cyminum and latitude, 244. 
Currant, phenology, 280. 
Cyanometer, 99. 
Darkness and absorption, 48, 50. 
exhalation, 51. 
germination, 42, 43, 45. 
respiration, 19. 
vegetation, 37. 
Darwin, germination, 44. 
Daubeny, light and vegetation, 26. 
sunshine and temperature, 71. 
Day-degrees, 73. 
Deblanchis, leaf temperature, 174. 
vegetation and temperature, 174. 
Decades, Dove's, 274. 
Degree, actinometric, 85, 86, 177. 
Dehérain, fertilization, 145, 158. 
soil nitrogen, 142. 
transpiration, 69-71. 
Desains, actinometer, 99. 
chlorophyl, 76. 
Descroix, Ballani’s actinometer, 97. 
evaporation data, 104. 
phenological data, 273-274. 
Detmer, germination, 44. 
plant development and cold, 338-340. 
Diastase, 17. 
Dodge, seeding and crop yield, 357-358. 
statistical tables, 7. 
D6llen, acclimatization gardens, 221. 
Dombes, France, fixation of nitrogen, 150. 
Dorpat, Russia, thermal constants, 238. 
Dove, climatic factors, 234. 
pentads and decades, 102, 274. 
Drainage and soil nitrogen, 364. 
Draper, light and chlorophy]l, 76. 
light and vegetation, 26. 
Drill planting, 334, 387, 355-358. 
Drontheim (Throndhjem), Norway, plant devel- 
opment, 39. 
Drought, 337, 363. 
Drouin, nitrifying bacteria, 149, 159. 
Dryness and plant growth, 19, 80. 
Duchartre, germination, 44. 
Durasno, Teneriffe, acclimatization garden, 221. 
Durin, sugar beets, 310. 
Dust, atmospheric, 130. 
Ebermayer, forest temperatures, 7. 
Economy in plant-life, 232. 
Edwards, germination, 33,37. 
thermal constants, 170. 
Effective temperature, 170. 
| Eggs, grasshopper, 36. 
hatching, 36. 
Eisenlohr, phenology, 235. 
| Elder, phenology of the, 281-290. 
Electricity, atmospheric, 131. 
and vegetation, 27. 
Elevation, influence on date of harvest, 278, 279. 
See also Altitude. 
Emory, soil thermometers, 66. 
Engelmann, chlorophy], 77. 
England, average wheat crop, 179. 
soil temperature, 58. 
transpiration, 69. 
wheat and temperature, 180, 181. 
Epernay, France, wine crop and weather, 256, 257. 
Epochs, phenological, 167, 172. 
Erman, acclimatization of grain, 220. 
phenological constants, 212. 
Europe, grain culture, 243-247. 
grape culture, 295-298. 
phenological charts, 243. 
phenological epochs, 171-172. 
Evaporation and crop yield, 245, 246. 
cultivation, 108. 
data for phenology, 273. 
from a plant, 19. 
soil temperature, 53. 
water surface, 104. 
wind, 107. 
Evaporimeter, Piche, 106. 
Everett, soil temperature, 58. 
Exhalation of carbonic acid gas, 49-52. 
Experimental hothouses, 24-37. 
plats, 352-355. 
Factors, climatological, 223, 232, 234. 
Faivre, germination and light, 44. 
Falling of leaves, epoch of, 186. 
Fécamp, France, chemical effect of sunshine, 96. 
Ferrel, actinometrie theory, 838, 188. 
Fertilization, clover, 158. 
Fertilizers, 162-166. 
crop yield, 121. 
nitrogen, 133, 134. 
rotation of crops, 162. 
soil temperature, 54. 
Fittbogen, water and crops, 118, 122, 123. 
Fitzgerald evaporation, 105. 
Fixation of nitrogen, 136-161. 
Flahault, chlorophyl, 39. 
sunlight, 40. 
Flax, water consumption, 125. 
Fleischer, germination, 44. 
Flowering, and altitude, 278. 
epoch of, 182, 185, 278-290. 
phenological constant of, 291, 293. 
second, 218. 
