78 



course it is not to be supposed that the physiological 

 influence of air blowing from the south, though merely 

 locally turned from the north, is the same as air brought 

 from the north. In order to have data concerning the 

 upper currents available for those who may in the future 

 wish to study their climatic influence a vane was sub- 

 scribed for, and put upon the Bremenbiihl at a height of 

 about 700 metres (2,300 feet) above the valley. It can be 

 seen from Davos Dorfli from which it is 2,600 metres; 

 and from Davos Platz, a distance of about 2,100 metres. 

 I'his I observed from Dorfli for two months, and Mr. 

 Rzerwuski observed it for January and February from 

 Platz. The vane is on a principle devised by Mr. Hugo 

 Leupold,* and has two large triangles below the vane, and 

 by the position of these the direction of the wind is read 

 with a key. There is also a very ingenious force measurer, 

 consisting of a flap which moves a ring above the vane : 

 and by the height of this ring the force is read. As the 

 instrument was only put up at the beginning of the winter 

 when the snow was on the ground, there has not yet 

 been the opportunity of testing its action, and these force 

 measurements are therefore omitted. The telescope which 

 I used was not large enough for reading this part of the 

 instrument on unfavourable days. People living in English 

 foo-s will be surprised to hear that with only two exceptions 

 this vane could be seen every day for four months. The 

 table of this upper wind is given at the end of the 

 paper. 



The wind in the valley in the position already mentioned, 

 was : — 



Davos Dorfli. Davos Platz. St. Moritz. 



1881-1882. 1882-1883. 



September, 1884 1281 



November, „ 759 561 1965 



December, „ 761 727 1422 



^ A New Method of reading the direction of tlie wind on exposed heights, <Src.; by H 

 Leupold, F.R. Met. Soc, CE. '<J J. K. Met, Soc, Vol. xi., Jan., 1886. 



