\ 
204 Dr. Faraday’s Experimental R ches in Electricity. 
2693. Finally, Iam obliged to say that I can find no experi- 
mental: evidence to support the hypothetical view of diamag- 
netic polarity (2640.), either in my own agg or in the 
“repetition of those of Weber, Reich, or others. I do not say 
that such a polarity does not exist ; and I shen think it possi- a0 
ble that Weber, by far more delicate apparatus than mine, had 
- obtained a trace of it, were it not that then also he would have 
certainly met with the far more powerful effects produced by 
copper, gold, silver, and the better conducting diamagnetics. If 
bismuth should be ‘found to give any effect, it must be checked 
and distinguished by reference to the position of the commutator, 
i . division of the mass by pulverization, influence of time, &c. It 
= ars to me also, that, as the magnetic polarity conferred by . 
iron or nickel in very eal quantity, and in unfavorable states, is j 
cae far more readily indicated by its effect on an astatic needle, or by f 
_~ pointing between the poles of a strong horseshoe magnet, than ' 
~ “by any such arrangement as mine or Weber’s or Reich’s, so dia- 
‘magnetic polarity would be much more easily distinguished i in the . 
° ‘e same way, and that no indication of that polarity has as yet 
“reached to the force and value of those already given by Brug- 
mann and myself. 
3 2694. So, at present, the actions represented or typified by 
<i ‘iron, by copper and by bismuth, remain distinct ; and their rela- 
*. -tions are only in part made known to us. It cannot es doubted 
that a larger and simpler law of action than any we 
quainted with, will hereafter be discovered, which shall include 
2 these actions. at once; and the beauty of Weber’s suggestion 
is aia? this peepect, was the chief inducement to me to endeavor to 
pate, 
‘~ Seon “T “Thongh from the considerations above expressed (2693. ) 
ae T had little hdpes of any useful results, yet I thought it right to 
aaa ‘certsiaPinagnecrysale cores to the action of the appa- 
Oh ’ One core was a large group of symmetrically disposed 2 
ree rae ‘of bismuth (2457, )s another a very large crystal of red | 
I ferroprussiate “of: potassa; a third a crystal of calcareous spar; 
aut a fpurth ai 8 ia large crystals ‘of protosttlph ate of i me 
é 
: 2} 
Ce 
ee me 
: 
re. 
_ These were formed into cylinders of which 
a pts miameberyabbliie axes ii 2 ) paralle? fo 
ti mind the second, third ‘an d fifth, ha 
