Chemistry and Physics. 237 
rogue, M. E. E. Buavier, who is engaged in studying electrical 
effects upon a line between Nancy and Paris, says, in substance: 
ey question. In reply to the point that the resistance of the | 
th n the two stations varies with different conditions, lt 
"3 adopted by M. Blavier had a resistance of 10,000 obms. 
Larroque believes that uncovered aerial telegraphic lines 
reply to the : . he lin 
points that it is necessary that the 
vormed wi small resistance, non-magnetic, well insulated 
ie absolutely free from humidity, M. Blavier states that it 1s 
aa 3 Ps prectaDly, = 
: 'nd that ‘earth currents could be observed on short lengths of 
