[ 478 ] 



5°. For the fame reafon the vapours that originate from 

 high mountains contain leaft, and thofe from plains moft, 

 and thofe alfo may vary in different fituations. 



8". Hence we fee that clouds originating from the condenfation 

 of thofe vapours, and each retaining, though more loofely, at leaft 

 a portion of the eledric fluid they originally involved, muft con- 

 tain difitrent portions of it, or be, what is called, differently elec- 

 trified, that is, plus or minusy at leafl relatively to each other. 



g''. Clouds of equal furfaces and fimilarly and equally eledri- 

 fied repel each other. But if the furfaces be very unequal, the 

 greater will gradually fteal the eledron from the fmaller if brought 

 into conta£l, as Coulomb has fliewn with refpedl to metallic balls 

 fimilarly eledrified. Mem. Paris, 1787. If near, but not in con- 

 tail, the greater will throw the leffer into a contrary ftate and then 

 attrad it. 



10". CIlouds diflimilarly eledrified, and beyond the flriking 

 dillance, attradt each other. 



11°. So alfo portions of air impregnated, but often far from 

 being faturated with vapours unequally eleflrified, ad upon each 

 other, thofe more ftrongly eledrified robbing the weaker of a 



portion 



