etna 
x/ecemrjer; xnersHcunu wirn a mean electricity by the months 
of March, April, May and October; and the third with the 
lowest electricity by the months of June, July, August and 
September. 
The aggregate monthly mean of 
The first group in 1861 is 52.9—in 1862, 54.6 
The second “ “ 33.5 “ 35.2 
The third “ " 14.1 10.5 
Thus in 1801 the third group prevailed, and in 1862 the 
first and second. But these differences are so well balanced 
throughout the year, that the mean of the whole year in 
1861 and in 1862 is exactly the same, namely, 8.4. Such an 
identity in the yearly result, even to decimals, is of course 
not to be expected every year; but it seems to prove, at 
least, that the yearly mean of electricity is as cdnstant as 
that of temperature, of relative humidity, and of atmospheric 
pressure. 
The third table, showing the daily periodicity of atmos¬ 
pheric electricity, confirms the daily two maxima and two 
minima of electricity as an undeniable fact. 
SH3dVd NNVH139N3 3SSf03 S 
Naaavs i»wvio a ranossi W 
