APPENDIX TO MEMOIR OF PELTIER. 199 



We will cite farther as extreme points the islands of Feroe and lakoutsk : 



It has been our purpose, as far as possible, to introduce into these tables only- 

 places of little elevation above the level of the sea ; so that, in effect, there were no 

 corrections to make in regard to the height. Yet there are exceptions, Moscow 

 being 14S metres above the level of the sea, Kazan 58, Wilna and lakoutsk 

 117. These heights, however, are much too insignificant to have any notable 

 influence on the results, for it is usual only to admit a diminution of 1° Centi- 

 grade for 200 metres of elevation. 



The preceding tables suffice to show the rapid decrease of the mean tempera- 

 ture of winter for the same latitudes in advancing from west to east. The dimi- 

 nution of the al)solute quantity of rain in the year and the diminution of the 

 absolute and relative quantity of rain in winter are not less evident. If we count 

 the number of days of rain for the different countries of Europe, we have the 

 following* table : 



Number of days of rain in different regions of Euroi^e. 



If, instead of taking the number of days of rain, we take the quantity of rain 

 expressed in millimetres, we arrive at the same result : 



Quantity of rain in the different regions of Europe. 



Names of countries. 



Western England. 

 Western France. .. 

 Eastern France. ... 

 Plains of Germany 

 Western Russia — 



Kazan 



lakoutsk 



Ratio of this last quan- 

 tity to the former in 

 hundredths. 



26.4 



23.4 



19.5 



18.2 



17 



15 



10 



