4 
168 Prof. A. de la Rive’s Memoir of 
The general phenomenon'so unexpectedly discovered by Far- 
aday has hitherto remained unexplained, notwithstanding man 
investigations, and especially the persevering and remarkable 
researches of Mr, Verdet. 
(the same, for ex e, which served for the experiments on 
light) places itself equatorially (that isto say, transversely to 
is line ro ismuth is in the e ; 
such as iron, steel, nickel, &e. 
It therefore required ve werful means, such as Faraday 
