b MR. G. V. VERNON ON THE IRREGULAR BAROMETRIC 



Table V. contains similar data for the Great St. Bernard, 

 and the differences from 20 years' mean. 



Table VI. gives the relation between the mean tem- 

 perature and the amount of the oscillations at the two 

 stations. 



Table VII. gives the relation between the number of 

 the oscillations and the fall of rain at the two stations. 



Table VIII. gives the relation between the fall of rain 

 and the amount of the oscillations at the two stations. 



The maximum amount of oscillation at Geneva occurs 

 in January, and the minimum in August. The maximum 

 amount at the Great St. Bernard occurs in December; 

 and there appear to be two minima, one in June and the 

 other in August. 



The two curves (Plate I.) approach one another very 

 closely in July and August, as the following Table in- 

 dicates : — 



Month. 



Mean daily 

 oscillation. 



Mean monthly 

 temperature. 



Number of 

 oscillations. 



Geneva. 



Gt. St. 

 Bernard 



Differ- 

 ence. 



Geneva. 



Gt. St. 

 Bernard 



Differ- 

 ence. 



Geneva. 



Gt. St. 

 Bernard 



January . . . 

 February . . . 



March 



April 



May 



June 



in. 



0*138 

 0*133 

 0*123 

 0*118 

 0*092 

 0*079 

 0-075 

 0*071 

 0*085 

 0*115 

 0*125 

 0*129 



in. 

 0*107 

 0*106 

 0*103 

 0*090 

 0*075 

 0*064 

 0*068 

 0*064 

 o*o68 

 0*088 

 0*091 

 o*iii 



in. 



0*031 

 0*027 

 0*020 

 0*028 

 0*017 

 0*015 

 0*007 

 0*007 

 0*017 

 0*027 

 0*034 

 0*018 





 3i'5 

 34'2 

 38-9 

 46*7 



54-3 

 6i*9 



64*3 

 63*1 

 57*o 

 49*1 

 40*5 



33'o 





 14*4 

 16-3 

 i8*7 

 25*8 



32-3 

 39'6 

 42*6 

 42*1 



37'4 

 307 



22*0 

 18*5 





 17*1 

 17*9 

 20*2 



20"9 



22*0 



22*3 

 21*7 



21*0 

 19*6 



18*4 



18*5 



H*5 



147 



13*1 

 14*6 

 14*0 

 15*0 

 14*0 

 14*0 

 i6*o 



i3'9 

 14*1 



13*1 

 14*8 



12*9 

 12*3 



12*9 



13*0 

 14*1 



I2'3 



13*7 



14*2 



137 

 13*1 



11*9 

 13*1 



July 



August 



September.. 

 October . . 

 November .. 

 December .. 



Upon comparing the amount of oscillation with the 

 mean temperature, it will be seen, generally, that the 

 amount of oscillation diminishes as the mean temperature 

 increases, and vice vey^sd. With a difference of 32°- 8 be- 

 tween the warmest and coldest months at Geneva, we 



