269 
Duration, in days, from sowing to ripening, for winter 
wheat at Montsouris, 
France. 
| | | | | Average for 
| | | | | 1872-1881. 
Date of sowing.| 1872.| 1873.| 1874.| 1875.) 1876.| 1877.| 1878. 1879.) 1880.) 1881.) 1882. | tea 
| | Dura) nate. 
| ‘tio 
‘Da ys. 
September 22.-.| 201) 282] 284 | 285 | 287] 268/| 281 311 202) 285 | 290 | 287 | July 6 
September 29...| 290| 279| 287] 285 | 287] 264| 279} 308 | 293| 284) 289) 286 | July 12 
October 6 --.---- os | 2arv| 279 | 284| 285 | 263) 275 | 906 | 286 | 281) 285 | 282 | July 15 
October 13 ------ 283-| 274 | 276 | 281) 281) 263 | 272) 299) 282 | 277 | 281 | 279 | July 19 
October 20 ___--- 279 | 271 | 272 | 280] 277 | 262| 268) 296 | 279) 273) 276 | 276 | July 23 
October 27 ___.-- 272 | 267 | 269) 276 | 272) 258 | 265) 206 | 275 | 267) 271 | 272) July 26 
November 3.-._| 269 | 263] 265| 272| 266|-255| 261 | 290| 271) 261] 264| 267 | July 28 
November ile 262 | 260 | 259 | 260} 262 | 249) 258) 283) 266) 255 | 263 | 262 | July 30 
November 17 ...| 255 | 254 | 255 | 263 | 257 | 245 | 252 | 276 | 260) 252 259) 257) Aug. 1 
November 24._.| 248 | 249] 249) 257 | 250 | 240 | 248) 270 254 | 247 | 254 | 251 | Aug. 2 
December 1____- | 241.| 244] 242] 251 | 243 | 234] 243) 263 | 247) 241) 258 | 245 | Aug. 3 
December 8____- 234 | 240] 235 | 245 | 236 | 282) 234 | 256 | 240| 235 | 241 | 239 Aug. 4 
December 15____| 227 | 234 | 228 | 288] 229 | 231 | 232] 249 | 233 | 231 | 234 | 283 | Aug. 5 
December 22_...| 220 | 229) 221} 231 | 225 | 226 | 225 | 242 | 226 | 226 229 27 Aug. 6 
December 29....| 213} 226 | 217 me 219 | 220) 218) 236) 219) 220 222 | mL Aug. 7 
In the following table I present a summary of 
the preceding de- 
tails, showing the average duration and dates for the ten years from 
1872 to 1881, inclusive. 
To this I have added the average total daily 
radiation for crops sown in 1873 to 1880, as computed by Marié-Davy 
in actinometric degrees for two phases, viz, from heading to flower- 
ing, and for thirty days after flowering, which brings us through the 
greater and more important part of the ripening phase. 
Summary of dates and radiation for winter wheat during ten years, 1872-1881, 
at Montsouris, France. 
Average interval from sowing to— | Average) Aver- 
Date of sowing. Germi- Foeadin | Flower- | Ripen- Paes Rineel 
nation. | ing. ing. tion. ing. 
e Days. Days. Days. Days. | 
September co seesriee hese Fe ae cl 99 236 287 | Sept.29 | Dee. 30 
ShygiGual senha se Sees seen eee 7 | 120 236 286 | Oct. 6 | Jan. 27 
(OE HOOS ae ie ee __ ae eee 8 | 141 235 282 | Oct. 14 | Feb. 24 
(Oxewoy ove) See ee ee ee 8 | 147 233 | 279 | Oct. 21 | Mar. 9 
October cl siete a. ee a 11 | 154 231 276 | Oct. 31 | Mar. 23 
WREO DEE Ole een ne oe ee ee oe 20 | 155 227 | 272 | Nov. 16 | Mar. 31 
1: (AY SSETEL 1 as le eS ee 20 | 154 223 | 267 | Nov. 23 | Apr. 6 
RemriperslO st at etn Ot 33 | 151 219 | 262 | Dec. 13 | Apr. 10 
TICS TEA Ey 22 oe aa 36 149 214 257 | Dec. 23) Apr. 15 
November, 26...) A.2..--- seca cesses -csts 37 | 145 209 251 Dec. 31 | Apr. 18 
Wecembetie. os et: ee ae ae 2) 140 "208 245 | Jan. 12 | Apr. 20 
Monomer cy see rs Pekan Tein 41 | 135 197 239 | Jan. 18 | Apr. 22 
Degemibern dite to pea we ee 35 128 191 233. | Jan. 19 | Apr. 22 
Decempeolsye pose ee. ee eee. 38 124 184 227 | Jan. 29 | Apr. 25 
BecomPbar wees ee | 34 | 118 179 221 | Feb. 1] Apr. 26 
