268 ME. VERNON ON THE IRREGULAR OSCILLATIONS 



rain in precisely the same manner as in the two preceding 

 tables. 



We find from this table, that a number of oscillations 

 above the average is accompanied by a larger fall of rain 

 than that which accompanies a number of oscillations 

 below the average in the months of January, February, 

 March, June, October, November and December. In the 

 remaining months of the year, April, May, July and Sep- 

 tember, a number of oscillations in excess of the average 

 is accompanied by a diminished fall of rain. 



Leaving out of consideration the month of June as 

 being perhaps abnormal (observations for this month in 

 1851, 1857, 1^59 ^^^ 1 8^° being also wanting), it would 

 appear that we have two different laws, one for the six 

 winter months and another for the six summer months, — 

 one of these laws being the direct converse of the other. 



The mean for the eleven months gives the following : 



Number of Oscillations 

 above or below the average. 



Fall of Rain. 

 Inches. 



+ 1*96 



2-509 



— 2-02 



2*359 



This seems to show that on the mean of the entire year, 

 the number of oscillations does not seem to affect the fall 

 of rain, but only appears to do so when the separate 

 months or seasons of the year are taken separately. 



The apparent or real relation which appears to exist 

 amongst these various data, seems well worth further in- 

 vestigation with the aid of a longer series of observations. 



