384 



Pruning and climate, 341, 363, 364. 

 Pyrus communis, 242. 

 mains, 242. 



Quetelet, phenological constants, 181-189, 212. 



soil temperatures, 286. | 



time of germination, 37. 

 Quinchuqui, Colombia (?), wheat and tempera- 

 ture. 180. 



Radau, measurement of radiation, 81, 96. 

 Radiation, conjugate thermometers, 89. 



data for phenology, 273. 



influence on plants, 16. 



measurement of, 81, 89. 



plant development, 170. 



soil temperatures, 20, 53. 



thermometer readings, 235. 



wheat harvest, 253, 254, 269-271. 

 Radiometer, Bellani, 97, 273. 

 Rain, 'nitrogen in, 133-135. 



soil temperatures, 54, 110. 



sugar crop, 344-350. 

 Rainfall and crop yield, 116-127, 253. 



data for phenology, 273. 



plant development, 223, 234, 235, 245. 



soil moisture, 110-111. 



sugar beets, 125, 260. 



wheat crop, 341-343. 

 Rainy days, and plant growth, 117. 



soil moisture. 111. 

 Range of germination temperatures, 35. 

 Rape, water consumption, 120. 

 Rawson, rain and sugar in Barbados, 344-350. 

 Reaumur, thermal constants, 168. 

 Reforestation, 231. 

 Respiration, influence of light, 22, 37, 50. 



plants and seeds, 18, 47-48, 50. 



temperature, 19, 48. 

 Rhone, cold waves, 129. 

 Ribes rubrum, phenology, 280. 

 Richardson, grain and environment, 312-314. 

 Richmond, Va., wheat and temperature, 180. 

 Ripening, epoch of, 182, 186. 



latitude, 243. 



period, 183. 



thermal constant, 169, 173, 191, 226, 278-290. 



vine, 2.57. 



wheat, 253, 267. 

 Risler, water consumed by plants, 113, 246. 

 Robinet, silk worms, 36. 

 Roscoe, measurement of sunshine, 82. 



photochemical researches, 92. 

 Rotation of crops, 141, 144, 157. 



and artificial fertilizers, 162-166. 

 Rothamsted, England, composition of rain, 135. 



evaporation and crops, 245. 

 ■ fertilizers, 138, 142, 145. 



plat experiments, 355. 

 Royer, available moisture. 111. 

 Russell, evaporation, 106. 

 Russia, acclimatization of wheat, 220. 

 Rye, growing period, 243. 

 phenology, 280-290. 

 water consumption, 113, 120, 124. 



Sachs, climatic laboratory, 24. 

 chlorophyl, 38, 39. 

 light and vegetation, 26, 78. 



Sachs, limiting temperatures, 174, 335, 339. 



physiological studies, 6. 



tuber growth, 79, 80. 



ultraviolet light and plant growth, 80. 

 Sainfoin, fixation of nitrogen, 153. 

 St. Louis, electricity of air. 131, 152. 

 St. Petersburg, phenology, 214. 



thermal constants, 214, 216. 



.sunshine, 219. 

 Salfeld, inoculation of soil, 158. 

 Salkowsky, nitrifying ba^'teria, 139. 

 Sambucus nigra, phenology, 281. 

 Sanborn, fertilizers, 162. 

 Saunders, thaws and plant life, 128. 

 Sau.ssure, de, germination, 43. 

 Schleiden, potato and light, 39. 

 Schloesing, ammonia in soils, 136, 142, 143. 



atmospheric ammonia, 144. 



nitric ferment, 142. 

 Schloesing, jr., fixation of nitrogen, 150, 151. 

 Schott, sunshine tables, 101. 

 Schuebeler, acclimatization, 217, 220. 



climate and plants, 40. 



culture of grain in Europe, 243-247. 

 Schweitzer, maize experiments, 333. 

 Seeds, germination, 28, 41-52. 



relations to air and soil, 18. 

 Seeding. See Sowing. 



and harvest, 358-361. 

 Seignette, available moisture. 111. 

 Sendtner, phenological list, 189. 

 S^nebier, light and germination, 42. 



light and vegetation, 26. 

 Serafina, germs and forests, 130. 

 Serradella, fixation of nitrogen, 160. 

 Sesnmum orientate, germination, 28-36. 

 Seynes, de, germination, 33. 

 Shade, and plant development, 79. 



temperature, 238. 

 Sid^ration, 158. 



Silver chloride, measurement of sunshine, 92. 

 Sitmpis alba, germination, 28-36. 

 Singer, rain and soU temperature, 54. 

 Six, soil thermometers, 65. 

 Smithsonian Meteorological Tables, 101. 

 Smithsonian phenological list, 292-294. 

 Smut, wheat, prevention, 341. 

 Soaking, influence on germination, 37. 

 Soda, nitrate of, fertilizer, 163. 

 Soil, ammonia, 136, 139. 



cereals, 364. 



evaporation, 246. 



exhaustion, 142. 



moisture, 20, 104-127. 



temperature, 20, 53-65, 235, 273. 



thermometers, 21,65,66. 



wheat, 314-318. 

 Solar constant, 91. 

 Sorauer, water consumption, 123. 

 Sorghum, 337. 



South America, seasons, 221. 

 South Carolina, prize corn crop, 164. 

 Sowing, date of .and wheatharvest,263-272, 368-361. 



and crop yield, 337, 339, 355-358. 

 Sporer, acclimatization of grasses, 299. 

 Sports, origin of, 303, 362. 

 Starch and light, 41. 

 composition, 17. 



