ON IRREGULAR BAROMETRIC OSCILLATIONS AT GENEVA. 5 



II. On the Irregular Barometric Oscillations at Geneva 

 and on the Great St. Bernard, and their relations to the 

 Mean Temperature and the fall of Rain. By G. V. 

 Vernon, Esq., F.R.A.S., M.B.M.S. 



Bead October 15th, 1861. 



The present investigation has been undertaken in order 

 to see exactly what effect great altitudes produce upon the 

 irregular oscillations of the barometer. The whole of the 

 observations used at the two stations were made under 

 the direction of Prof. Plantamour of Geneva ; and this is 

 quite sufficient proof of their trustworthiness. The ob- 

 servatory of Geneva is situated in latitude 46° 1 1' 59" N., 

 and is 1335 feet above the sea. The Hospice of the Great 

 St. Bernard, at which the observations were made, is 

 situated in latitude 45° 15' 16" N., and is 8173 feet above 

 the sea. The distance between the two stations, measured 

 upon a horizontal plane, is 58 miles approximately, and 

 the difference of altitude 6838 feet. 



The data have been reduced and tabulated in the same 

 manner as in my paper upon similar oscillations at Man- 

 chester"^ ; so that it wiU not be necessary to describe the 

 process. 



Table I. contains the amounts of oscillation and the 

 number of oscillations for each station, arranged under the 

 separate months. 



Table II. contains the mean monthly temperatures at 

 Geneva, and their differences jfrom the mean of 20 years. 



Table III. contains similar data for the Great St. 

 Bernard. 



Table IV. contains the fall of rain and snow at Geneva 

 for each month, and the differences from 33 years^ mean. 

 * Vol. I. (Third Series) of the Society's Memoirs. 



