NOTES ON THE TWO ELECTRICITIES. 33 



position of heat that electricity by induction is 

 evolved ? 



When a body is charged with one of the two 

 electricities, electrical induction takes place in the body 

 to which it is presented is the heat of the induced 

 body decomposed, one of the constituents of which 

 is attracted, and the other repelled, by the adja- 

 cent body charged with one of the two electrici- 

 ties? 



I may state one or two examples of electrical in- 

 duction as, I conceive, they occur in nature. When 

 a cloud charged with one of the two electricities 

 passes over the spire of a church, the spire by elec- 

 trical induction is charged with the opposite electri- 

 city ; and when the attraction of the two electrici- 

 ties, that of the cloud and that of the spire, is such 

 as shall overcome the low conducting power of the 

 atmosphere, the electricity of the cloud descends and 

 unites with the electricity of the spire, and thus, in 

 common parlance, the spire is said to be struck with 

 lightning. 



Again, when a cloud charged with one of the two 

 electricities passes over the surface of the ocean, it 

 induces the opposite electricity in the water beneath ; 

 and because of the attraction of the two electricities, 

 that of the cloud and that of the water beneath, the 



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