On the PhceJiomena of the Eledrophoms. 991- 



different states and changes which the parts respectively 

 undergo, or to afford data upon which to bniid an account 

 of the rationale of its mode of operation : recourse must be 

 had to more delicate tests, and the most convenient method 

 is, to attach a pair of pith balls upon a projecting wire to 

 each plate, by which means the state of both may be ob- 

 served and ascertained at the same time. I shall now en-!' 

 deavour to exhibit a general view of all these changes, ar- 

 ranocd in a tabular form. 



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