290 TRANS. OF THE ACAD. OP SCIENCE. 



Negative Electricity was connected in 



1861. 1862. 1863. 1864. 



19 times, with thunderstorms. 



20 " with rains without thunder and lightning. 

 20 " with dry sstorms without rain, and without 



thunder and lightning. 

 " with snowing. 



Rain without Thunderstorm was accompanied with 



POS. ELEC. NEC. ELEC. NO ELEC. OR 0. 



In 1861 50 times, 23 times, 15 times. 



1862 36 " 28 " 34 " 



1863 19 " 27 " 51 " 



1864 19 « 20 " 65 " 



124 times, 98 times, 165 times. 



Snowing was accompanied with 



POS. ELEC. NEG. ELEC. NO ELEC. OR 0. 



In 1861 23 times, 2 times, times. 



1862 36 " 3 " 1 " 



1863 34 " 5 " 5 " 



1864 19 " " 12 " 



112 times, 10 times, 18 times. 



REMARKS. 



The foregoing tables contain the numerical abstract of my 

 observations on Atmospheric Electricity with other meteoro- 

 logical phenomena for the last four years. The observations 

 have been made in the same locality and in the same manner 

 as mentioned in my first report on the subject in Vol. II., 

 No. 1, of the Transactions. One and the same glass thread 

 has been used in all of them, proving thus its superiority over 

 cocoon threads and other fibrous substances. 



The first table and diagram No. 2 give the monthly mean 

 of positive atmospheric electricity in the four years, and show 

 a more or less regular descending and ascending line for ev- 

 ery year from January to December. The monthly mean 

 of the four years together exhibits a most regular descent 

 from January to July and August, and a regular ascent up 

 to December, The greatest quantity of positive atmospheric 



