269 



Durutio)!. in days, fruin soirinij to ripcniiH), for irititrr ivheat at Moiitsotirift, 



France. 



In the following table I present a summary of the iDreceding de- 

 tails, showing the average duration and dates for the ten years from 

 1872 to 18S1, inclusive. To this I have added the average total daily 

 radiation for crops sown in 1873 to 1880, as computed by Marie-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 icinter ivheat during ten years, 1872-1881, 

 at Moiitsouris, France. 



Date of sowing. 



Average interval from sowing to— Average Aver- 



date of age date 



Ripen- germina- of head- 

 ing, i tion. ing. 



Germi- 



September 22. 

 September 29. 



October 6 



October 13.... 

 October 2(J..-. 

 October 27.... 

 November 3.. 

 November 10. 

 November 17. 

 November 34. 

 Decern V)er 1 .. 

 December 8 . . 

 December 15 . 

 December 22 . 

 December 29 . 



Days 



Days. 



Sept. 29 

 Oct. 6 

 Oct. 14 

 Oct. 21 

 Oct. 31 

 272 ' Nov. 16 

 Nov. 23 

 Dec. 13 

 Dec. 23 

 Dec. 31 

 Jan. 12 

 .Tan. 18 

 Jan. 19 

 Jan. 29 

 Feb. 1 



Dec. 

 Jan. 

 Feb. 

 Mar. 

 Mar. 

 Mar. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 

 Apr. 



