STUDIES IX ATMOSPHERIC ELECTRICITY. 



13 



Nov. 18. X. gale, 



Nov. 25. X. gale, 



Dec. 27. X.AY. gale, 



Dec. 29. X. gale, 



potential positive, but low towards 



afternoon, (rain on 17th.) 

 potential low but pos. (min on 24t]i.) 

 potential neg. 10a.-4p. 

 potential neg. .3p.-4p. 



EFFECT OF FOG AND HAZE. 



Mornings with fog or haze are generally characterized by a high 

 potential with energetic fluctuations. (See Fig. o.) Sometimes 

 there are no sensible effect, and this we find mostly in cases when the 

 ground is wet through previous precipitation. (See Fig. 4. and 5.) 

 AYe may think that when the ground is dry, the particles of water 

 become electrified positively with respect to the earth, while if the 

 ground be wet, no electrification is produced. 



A few instances are adduced. 



Mornings Avith fog : — 



April 6. potential high ; 

 June 29. potential high ; 

 July 26. potential very high ; 

 Oct. 4. potential normal ; 

 Xov. 20. potential low (rain on 



Will) ; 

 Dec. 9. potential high ; 



Jan. 8. potential very high 



June 18. potential high ; 



July 25. potential high ; 



July 27. potential very high 



Oct. 30. potential very high 



Dec. 3. potential high ; 



Dec. 10. potential high. 



Morniniifs with haze : — 



Jan. 23. potential very high ; 



Feb. 12. potential very high ; 



April 8. potential high ; 



Dec. 10. potential liigh. 



Feb. 5. potential very high ; 

 Feb. 13. potential very high; 

 April 23. potential very high ; 



