OSCILLATIONS AT GENEVA AND GREAT ST. BERNARD. 11 



January... 

 February 

 March . . . 



Apjril 



May 



June 



July 



August ... 

 September 

 October . . . 

 November 

 December 



Geneva. 



Great St. 

 Bernard. 



inches. 

 28*607 

 28'6i9 

 28-566 

 28-497 

 28-528 

 28*623 

 28-638 

 28*642 

 28*652 

 28-593 

 28*576 

 28-701 



inches. 



22-057 



22-074 



22-044 



22*077 



22*161 



22-338 



22-377 



22-381 



22-335 



22*268 



22*087 



22*156 



DiflFer- 

 ences. 



inches. 

 6-550 



6'545 

 6*522 

 6*420 

 6*367 

 6*285 

 6*261 

 6*261 

 6-317 

 6*325 

 6-489 

 6*545 



Upon comparing these figures with the amounts of 

 oscillation, we find that at Geneva the minimum pressure 

 occurs in April, and the maximum in December, neither 

 of which dates agrees exactly with that of maximum or 

 minimum amount of oscillation. 



At the Great St. Bernard, the minimum pressure occurs 

 in March, or a month earlier than at Geneva, whilst the 

 maximum occurs in August. The maximum pressure at 

 this station occurs at the period of minimum oscillation, 

 whilst at Geneva the period of maximum pressure (De- 

 cember) is a month earlier than the period of maximum 

 oscillation. 



On comparing the differences between the mean pres- 

 sures at the two stations, it will be observed that this 

 difference is at a maximum in January, gradually diminishes 

 to July and August, and then increases to the end of the 

 year. From the same data we find that the differences 

 in the amounts of atmospheric pressure diminish as the 

 differences between the mean temperatures of the two 

 stations increase. 



The fall of rain and snow at Geneva, on an average of 

 33 years, was 32*224 inches. Taking an average of 11 

 years, 126 days are rainy. At the Great St. Bernard, 

 according to 20 years^ observations, the fall is 56*929 



