MECHANICAL ELECTRICITY. 295 



conductible by water ? A rod of Bismuth was 

 arranged for thermo Electricity in this experiment, 

 and the voltaic decomposition apparatus was 

 employed, and it was discovered that the thermo 

 Electric current is utterly inconductible hy water 

 or acidulated water ; the heat was carried on 

 to fusion, but the galvanometer did not deflect in 

 any appreciable manner. It is also inconductible 

 by a strong solution of sulphate of copper. 



Exp. 47. The thermo Electric current from 

 Bismuth passed through a large piece of Bismuth 

 deflecting the galvanometer gradually up to 15°, 

 by the steady heat of a spirit lamp. 



Exp. 48. Mechanical Electricity is not con- 

 ducted at all by solution of sulphate of copper. 



Exp. 49 And is also inconductible hy acidu- 

 lated water i in the ordinary decomposition appa- 

 ratus. 



Exp. 50. But is readily transmitted by an 

 intervening piece of Bismuth, of equal tempe- 

 rature. 



