GENERAL ACCOUNT OF COMMON PHENOMENA 23 



ppeared, but much less in quantity, and another spark may be 

 obtained. Leaving it again for a time after discharge, another 

 but still smaller charge gathers and a third spark may be 

 obtained, and so on. These successive charges are termed residual 

 charges, and the successive sparks residual discharges. We shall 

 give the probable explanation of the phenomenon later. 



