116 Scientific Intelligence. 
iments of this nature, could not, it is imagined, be more strikingly ex- 
hibited. 
intelligible with those of paramagnetic ones, when we assume that the — 
former class possess a polarity the same in kind, but the opposite in di- | 
rection, to that of the latter. > 
tis well known that a bar of iron surrounded by a helix in whicha 
tw phenomena of attraction and repulsion at its 
two end ich we give the name of polarity. 
contains ount of experiments made with the view of ascertaini 
whether si phenomena were exhibited by a bar of pure bismuth 
A cylinder of t r substance, 64 inches long and 0-4 of an inch 
suspendec 
copper wire, so that it could vibrate freely from side to side. ‘Thee i 
of two electro-magnetic cores were brought to bear upon the two ends — 
i as so arranged that the two magnetic poles — 
acting upon the bar might be of the same or of oppusite qualities, The — 
helix being first excited by a strong current, @ current 
less power was sent round the electro-magnetic cores, 
of considerably 
eo aa 3 pa action 
verted into repulsion. 
the current in the helix was changed, the recession was sto 
2 
