OSCILLATIONS AT GENEVA AND GREAT ST. BERNARD. 7 



have a difference in the amount of oscillation of 0*063 inch, 

 whilst at the Great St. Bernard a difference of 28°* 2 gives 

 0*039 ^^^^ ^^ ^^^ difference in the amount of oscil- 

 lation. The period of minimum oscillation appears to occur 

 somewhat later than the period of maximum temperature. 



As the stations become more elevated above the sea, 

 the curve appears to become flattened, so that at some 

 particular altitude, at present unknown, the curve would 

 approach a straight line, and nearly all the disturbance 

 would disappear, or, at least, owing to the greatly di- 

 minished density of the air, become imperceptible. 



No law regulating the number of oscillations can be 

 deduced from these observations. The maximum number 

 of oscillations occurs at Geneva in August, and two mi- 

 nima in February and November ; at the Great St. Bernard 

 the maximum occurs in August, and a single minimum in 

 November. 



The mean daily amount of oscillation for the year is, 

 at Geneva, OT069 inch, the total for the year being 

 39*07 19 inches; at the Great St. Bernard the mean daily 

 amount is 0*0865 inch, total for the year 31*5941 inches. 



The mean annual number of oscillations is, for Geneva, 



171*3; and for the Great St. Bernard 157*2. 



Great St. 

 Geneva. Bernard. 

 Number of oscillations in the six winter months 84*4 76*2 



Number of oscillations in the six summer months 86*9 8i"o 



There appears to be a greater relative increase in the 

 summer months at the Great St. Bernard than at Geneva : 

 Geneva gives an increase of 2*96 per cent., whilst the 

 Great St. Bernard gives 6*30 per cent. 



The following small Table gives the total amount of 

 oscillation for each year, and the total number of oscil- 

 lations : — 



