MAGNETIC CHARACTERS OF METALS, &c. 635 
in precisely the same manner as described by 
Becquerel; that is, with their longest axis at 
right angles to the line of magnetic force. 
13. Dr. Faraday has attempted a classification 
of a great number of bodies under the two 
following heads :—Magnetics and Diamagnetics. 
The former class, of which iron is the grand type, 
become arranged, whilst under magnetic influence, 
with their longest axis in the magnetic line of 
force ; and the latter class, of which bismuth is 
the type, become arranged at right angles to the 
magnetic line of force. In the magnetic class, 
Dr. Faraday places some of those bodies which, 
according to M. Becquerel’s nomenclature, would 
be placed in the other class, or amongst those 
which become arranged at right angles to the line 
of magnetic force. Such, however, is the condi- 
tion of this interesting imquiry at the present 
time, no two of those hitherto engaged in it 
having arrived at similar results in any series of 
experiments that have been undertaken. 
14. The inquiries that I have made in this 
department of magnetics have been conducted 
partly by the employment of magnetic needles, 
partly by permanent steel magnets, and partly by 
