Michael Faraday, his Life and Works. 165 
induction. . His discoveries in electrodynamical induction have 
had still more important consequences, by introducing the 
notion of mechanical movement into the essence of electrical 
movement, and thus enabling Weber to combine, in an equally 
ingenious and satisfactory manner, the mechanical phenomena 
- of electrodynamics, discovered by Ampére, with the electrical 
phenomena due to mechanical movement, discovered by Far- 
ay. 
Ampére and Faraday,—two names which will always be 
united by the intimate relation of their works to the history 
of the science of electricity, in which they have opened such 
new and vast horizons ; and yet minds as dissimilar in their 
mode of proceeding as similar in the power of their genius. 
Both eminently endowed with that faculty of divination which 
generates great discoveries, but one of them, Faraday, arriv 
ing at them by impression, by a kind of instinct which never 
deceived him,—the other, Ampére, advancing with a more cer- 
tain step, having as his instrument those calculations which 
he handled with such remarkable ability, and thus arriving at 
results which he hardly required experiment to confirm, 80 
certain was he that this would not contradict him. - 
- 
IV, 
erasing a glass prism in the direction of its length. This pr 
two square and parallel ba the 4 
; eee Ss. 
Which are os ontielad, and which are those by which the po- 
a‘ 
tin Se 
