Chemistry and Physics. 255 
“Tf the flame was raised until about two-thirds of it were above the 
level of the axial line, and the poles approached so near to each other 
freely between them; then, on rendering the magnet active, the flame 
became more and more compressed and shortened ; and as the effects 
proceeded to a maximum, the top at last descended, and the flame no 
~“ When the magnet was thrown out of action, the flame resumed its 
ordinary upright form between the poles, at once ; being depressed and 
ivided again by the renewal of the magnetic action. 
“When a small flame, only about one-third of an inch high, was pla- 
ced between the poles, the magnetic force instantly flattened it into an 
equatorial disc. : 
‘If a ball of cotton about the size of a nut be bound up by wire, 
Soaked in ether and inflamed, it will give a flame six or seven inches 
high. This flame rises freely and naturally between the poles; but as 
Magnetic force being either induced or not at the time. 
the course of the streams, catch-tubes of thin glass were arranged, 
Usually one over (or below, if the gas was lighter than the atmosphere) 
the axial line, and one at each side. hese tubes were a 
ends. The air was kept undisturbed about the magnetic poles bya 
“sheltering chamber” of mica. 
