385 
Statistical method in botany, 7. 
Stettin, Germany, phenology, 186. 
Stone, sorghum, 337. 
Structure of seeds, 35. 
Sturtevant, cultivation and evaporation, 108. 
pepper, 307. 
range of plants, 9. 
thermal constants, 335-337. 
Stuttgart, Germany, acclimatization, 220, 233. 
Sugar beets, and climate, 259-263. 
rainfall, 125. 
time of harvest, 310. 
Sugar crop and rain, Barbados, 344-350. 
climate, 363. 
Summation of temperature, 279-290. 
Sunshine and absorption by seeds, 47, 48. 
assimilation, 67-80. 
chlerophyl, 75. 
diminution, 99. 
distribution, 72. 
dust and diffused sunshine, 81. 
effects, 22. 
' hour degrees, 74. 
latitude, 244. 
measurement, 22, 81-103. 
Montsouris, 89, 90. 
photochemical intensity, 92. 
photographic measurement, 95. 
plant development, 160, 244, 247. 
recorder, 21. 
records, 99, 100. 
ripening of grain, 73. 
soil temperatures, 20. 
sugar beets, 259. 
total possible, 101-103, 219. 
transpiration, 69. 
wheat crops, 255. 
Sun temperatures, 238. 
Surface slope and soil temperature, 57. 
Sweden, phenology, 186. 
Switzerland, acclimatization of grains, 220. 
Symbiotic life, 138. 
Tables of possible sunshine, 101-103. 
Taimyr, Siberia, grasses, 299. 
Temperature, black bulb, 171. 
*  ehlorophyl, 38. 
effective, 170. 
germination, 28-36. 
ineffective, 36. : 
low, and vegetation, 338-340. 
phenology, 211, 2738. 
plant development, 19, 168, 211, 234, 236, 239. 
respiration, 19, 48, 50. 
soil, 20, 53-66. 
sugar beets, 260. 
summation, 279-290. 
wheat crop, 341-343. 
Teneriffe, botanical garden, 221. 
Tessier, light and vegetation, 6. 
Thaws and plant life, 128, 237. 
Theory of compensation, 219. 
Theory of errors in agriculture, 353, 354. 
Thermal constants, 168, 189-191, 236-248, 278-290, 
320-331. 
barley, 319. 
grape, 256-259. 
2667—05 m——25 
Thermal constants, maize, 336. 
oats, 320. 
peas, 336. 
wheat, 251-256, 265, 267, 278, 319. 
Thermoelectric actinometer, 99. 
Thermoelectric sunshine recorder, 97. 
Thermometer, soil, 21, 65, 66. 
Thermometric constants and plant growth, 168. 
Thermometric measurement of sunshine, 83-92, 
96. 
Thermophone, 65. 
Thorpe, insolation measurements, 82. 
photochemical researches, 94, 
Thunderstorms, and souring of milk, 341. 
and nitrates, 135. 
Thuya, chlorophy] and light, 38. 
Tilia europexa, Tilia silvestris, phenology, 281. 
Timiriazeff, chlorophyl, 38, 41. 
Timothy, cellulose, 18. 
time of harvest, 310. 
Tisserand, grain culture in Europe, 243-247. 
light and vegetation, 41. 
sunshine and grain, 73. 
vegetation in high latitudes, 40. 
Tokyo, Japan, soil temperature, 54. 
Tomaschek, thermal constants, 173. 
Transmission of solar heat, 92. 
Transpiration, 19, 112. 
diurnal periodicity, 70. 
plant temperature, 53. 
and sunshine, 67-80. 
Treadwell, souring of milk, 341. 
Trees and rapid thaws, 128. 
Trifolium repens, germination, 28-36. 
Tubercles, on nitrogen-fixing plants, 186, 137. 
Tubers, dryness and sunlight, 80. 
Ultraviolet light and plant growth, 80. 
United States, average wheat crop, 179. 
crops and climates, 351-364. 
evaporation, 107. 
phenology, 186. ° 
Upsala, Sweden, germination of wheat, 39. 
phenological observations, 241-242. 
Valognes, France, epoch of awakening, 185. 
Van Tieghem, phenological constants, 179. 
Vegetation, annual progress, 183. 
beginning of, 238. 
climatic factors, 188. 
development of, 232. 
high latitudes, 40. 
Linsser’s law, 214, 215. 
thermoscope, 174. 
wind, 129, 
zones, 224. 
Venice, Italy, phenology, 185. 
plant development, 231. 
sunshine, 219. 
Vienna, Austria, phenology, 189, 190. 
plant development, 231. ° 
thermal constants, 238. 
Ville, atmospheric ammonia, 144. 
fertilization by clover, 158. 
fixation of nitrogen, 146, 158, 155, 159. 
germination, 44. : 
Vilmorin, thermometer exposure, 176. 
