[A] I have since been able to explain these differences, and prove,
with several metals, that the effect is in the order of the conducting
power; for I have been able to obtain, by magneto-electric induction,
currents of electricity which are proportionate in strength to the
conducting power of the bodies experimented with (211.).

§. _Royal Institution, November 1831._

_Note._--In consequence of the long period which has intervened between the
reading and printing of the foregoing paper, accounts of the experiments
have been dispersed, and, through a letter of my own to M. Hachette, have
reached France and Italy. That letter was translated (with some errors),
and read to the Academy of Sciences at Paris, 26th December, 1831. A copy
of it in _Le Temps_ of the 28th December quickly reached Signor Nobili,
who, with Signor Antinori, immediately experimented upon the subject, and
obtained many of the results mentioned in my letter; others they could not
obtain or understand, because of the brevity of my account. These results
by Signori Nobili and Antinori have been embodied in a paper dated 31st
January 1832, and printed and published in the number of the _Antologia_
dated November 1831 (according at least to the copy of the paper kindly
sent me by Signor Nobili). It is evident the work could not have been then
printed; and though Signor Nobili, in his paper, has inserted my letter as
the text of his experiments, yet the circumstance of back date has caused
many here, who have heard of Nobili's experiments by report only, to
imagine his results were anterior to, instead of being dependent upon,
mine.

I may be allowed under these circumstances to remark, that I experimented
on this subject several years ago, and have published results. (See
Quarterly Journal of Science for July 1825, p. 338.) The following also is