170 Prof. A. dela Rive’s Memoir of 
in that of the earth itself, or perhaps even in that of the sun, 
that we must seek the cause of all the phenomena presented 
view upon this particular question. 5 
We pass in silence over a multitude of interesting details 
upon diamagnetic polarity, upon the distinction to be set up 
between magnetic and diamagnetic bodies, and upon the poss!- 
ble relation between gravity and electricity. In 1850 Faraday 
reverted to this question, which he had previously attempted 
but without success, We see that it is with regret that he 1s 
obliged to relinquish the discovery of this relation, which he 
had twice sought after; but with his usual good faith he ad-_ 
mits that, although convinced that it exists, he was unable to 
find any fact to establish it. If experiment, which he knew 
so well how to employ constantly, gave him a negative response 
would not this be because his point of view was not correct ? 
and did not his error arise from his forming too vague ideas as 
to the transformation of forces, not taking sufficiently into ac- 
count that it is the work effected by the force, and not = 
force itself, that must be considered in questions of this kind ? 
ls 
We have passed in review the principal labors of Faraday ; 
and it only remains for us, in se to complete this notice, t0 
endeavor to form an idea of the special character of these labors, 
and of the influence which they have exerted on the p 
of science ‘sgt 
~The first character that strikes us is their number., What 
Faraday published in the form of memoirs from 1820 to 1855 
