184 M. Berghaus on the Epochs of Vegetation, 



At Paris, in May ; 



In England, the 26th April ; 



At Upsala, the first days of May. 

 Investigations made regarding the various periods of the 

 development of the flowers or efflorescence in the middle lati- 

 tudes of Europe and North America, according to a communi- 

 cation made by my friend the late Mr Schuhler, prove, as a 

 general result, that the development of flowers is four days 

 later for each degree of latitude towards the north. Accord- 

 ing to corresponding observations which were made, at the 

 request of Schiibler, by the naturalists assembled at Berlin in 

 the autumn of 1828, during the following summer at Parma 

 in Lombardy, and in various places farther to the north, it ap- 

 pears that the same plants flower at Zurich six days later than 

 at Parma, at Tubingen thirteen days later, at Jena seventeen, 

 at Berlin twenty -five, at Hamburgh thirty-three, at Greifswald 

 thirty-six, and at Christiana no less than fifty-two days later 

 than at Parma. 



This likewise holds good in a corresponding way with vege- 

 tation at points at a higher elevation. In a district lying 1000 

 feet higher, the growth of plants, in our geographical position, 

 is rendered at least ten to fourteen days later. 



In Saxony the following observations were made in the 

 years 1833 and 1834, regarding some of the periodical pheno- 

 mena of the vegetable kingdom which depend on the influence 

 of the climate ; and the subjects of these experiments were the 

 chief plants used as food. 



Plxe — Absolute Height. Period of Sowing. 



Efflorescence. 



Harvest. 



Vi'intei: Wheat, Triiicum vuJgm 



Valley of the Elbe, 350-400 

 Freiberg, . 1000-1200 



Oct. 1.-22. 

 Sept. 12.-Oct. 2. 



May ;M.-June 15. 

 June 10.- July 1. 



July 20.-Aug. 

 Ausr. 10.-20. 



Rye, Sccalc cercale. 



Vallev of the Elbe. 350-400 

 Freiberg, . 1000-1200 

 Harienberg, | 

 Annaberg, J 

 Wiesenthal, . 27": E! 



1900-2000 



Oct. 1.-20. 



Sept. 14. -Oct. 18. 



Sept. 16.0ct. 19. 



Sept. 18.-Oct. 3. 



May 20.- June 10. 

 May 22.-June 12. 



June 26.-July 9. 



June 28.-July 4. 



July 4.-24. 

 Aug. 1.-14. 



Aug. lO.-Sept. 15. 



Aug. 30.- Sept. 12. 



