Chemistry and Physics. 139 
for nitrogen. When it is the positive electrode that is acted on 
there is scarcely any appreciable effect. But the kind of magne- 
tism makes no difference. 
en the circuit contains several consecutive Geissler tubes, 
all placed in the same way, each having its negative electrode 
the magnetic tube, remains the same. 1s 
Special and peculiarly intense resistance, having its seat at the 
dimensions of the aureola and the resistance to the passage of the 
power, A very great quantity of electricity is thus produced, ca- 
pable of giving long brushes and sparks, of deviating a galvanom- 
eter needle, of decomposing water, and in Geissler tubes of showing 
the stratification of the light. A new method of measuring elec- 
tric tension has been employed, dependent on the greatest a8 
