M'Clellanu AND GiLMouR — The Electric Charge on Rain. l7 







Negative Rain. 











Afontli. 



No. of observations, showing negative charge 

 inE.S.U. 



per c.c. 



Total 

 No. of 

 obs. on 

 negative 



rain. 



Average 

 cliarge 



< -1 



■1--2 



•2- -3 



•3- -4 



•4- -5 



>-5 



per c.c. 

 in E.S.U. 



January, . 



12 



3 







1 







2 



18 



■19 



February, . 



7 



1 



















S 



•03 



March, 



83 



4 



5 



n 







(1 



98 



•08 



April, 















2 



1 



4 



7 



i-ai 



May, 



14 























14 



•015 



June, 



I 







2 







2 







5 



•30 



July, 



155 



2 



1 











2 



160 



•034 



Airgusf, 



33 



2 



4 



1 



1 



4 



45 



•14 



Totals, 



305 



12 



12 



4 



4 



IS 



355 



•09 



Perhaps one of the most noticeable and unexpected features of the above 

 tables is the increasing tendency for the rain to be negatively charged 

 towards summer. This may be seen even more readily from the following 

 table : — 



Month. 



Total 



No. of 

 observations. 



Percentage 

 of + rain. 



Percentage 

 of - rain. 



Average + 

 charge 

 per c.c. 



Average — 

 charge 

 per c.c. 



January, . 



208 



9P3 



8-7 



•24 



•19 



February, . 



234 



96 •e 



3^4 



•19 



•03 



Marcli, 



213 



54-0 



40-0 



•19 



•08 



April, 



37 



81 •O 



19^0 



•53 



1^02 



May, 



24 



41^6 



58^4 



•05 



•015 



June, 



30 



83 •S 



ie^7 



•14 



•30 



July, 



184 



13^0 



87 •O 



•19 



•034 



August, 



412 



89^0 



11-0 



■09 



•14 



Totals, 



1342 



73-5 



26 •S 



•17 



•uu 



During the later months of the period, but especially during July, there 

 was a good deal of rain of the type classified by M'Clelland and Nolan' as 



• Lo(. cit. 



