a lac a 4 
Dr. Faraday on Magnetic and Diamagnetic Action. 233 
The longitudinal lines or veins, though in general nearly paral- 
lel, are by no means accurately so, but are wavy in direction, 
approximating to one another at uncertain intervals, and occasion- 
ally even becoming confluent. This structure somewhat resem- 
bles that of the leaves of Sparganium natans, but is far more mi- 
nute and delicate. It approaches still more closely in texture to 
the leaves of some species of Eriocaulon. 
London, June 30, 1846. f 
Azr. XXV.— Generality of Magnetic and Diamagnetic Action ; 
_ by M. Farapay, Phil. Trans., part i, for 1846, p. 52. 
Parl 
Iv the last Volume of this Journal, p. 421-425, we gave an ab- 
stract of Dr. Faraday’s recent researches on magnetic actions. If 
our limits would permit, we should wish to publish the whole me- 
Moir, but must content ourselves with giving the general conclu- 
sions with which the distinguished author closes his remarkable 
es.—Eps. 
_ 2417.* Such are the facts which, in addition to those presented 
by the phenomena of light, establish a magnetic action or condi- 
tion of matter new to our knowledge. Under this action, an 
elongated portion of such matter usually places itself at right 
angles to the lines of magnetic force ; this result may be resolved 
into the simpler one of repulsion of the matter by either mag- 
hetic pole. The set of the elongated portion, or the repulsion of 
the whole mass, continues as long as the magnetic force 1s sus- 
tained, and ceases with its cessation. 
7 2418. By the exertion of this new condition of force, the body 
moved may pass either along the magnetic lines or across them ; 
and ‘it may move along or across them in either or any direc- 
tion. So that two portions of matter simultaneously subject to 
this power, may be made to approach each other as if they were 
Mutually attracted, or recede as if mutually repelled. All the 
phenomena resolve themselves into this, that a portion of such 
matter, when under magnetic action, tends to move from stronger 
to weaker places or points of force. When the substance is sur- 
rounded by lines of magnetic force of equal power on all sides, 
7 numbers are those of Dr. Faraday’s Experimental Researches. 
