Miscellaneous Intelligence. 157 
Syracuse University.—Prof. A. Wrncuett, long connected 
i 
8. The Earth a Great Magnet ; by Atrrep Marswati Mayer, 
Ph.D., Professor of Physics in the Stevens Institute of Tech- 
Ch 
of. 
we present the following from the Philosophical 
January, p. 65: 
: This is the report of a lecture delivered before the Yale Scien- 
tifie Club on February 14, 1872, in which the lecturer proposed to 
present to his audience “one prominent truth in simple and strik- 
ing experiments.” The truth which is kept steadily before the 
The lecture itself is a masterly production, and exhibits the re- 
sult of much close reading as well as experimental research, 
@pparatus employed in manipulation, the reader is conducted from 
consideration of the most ordinary magnetic phenomena pre- 
sented by bar and electro magnets, to that of the same phenomena 
evolved from terrestrial magnetism. A paragraph selected from 
the closing portion of the lecture will fully substantiate this state- 
ment, 
“ Now we have finished our experiments; and what have they 
shown ? I have temporarily magnetized a bar of soft iron, by 
pointing it toward a pole of our large magnet. I did the same 
a ea 
Vibrating it with a blo a hammer. I did the same with a 
bar, struck when pointed toward the earth’s magnetic pole. I 
ont YO the action of a small magnetic disk on iron 
filings placed above and around it. You saw that the earth pro- 
duced the same action on the beams of the aurora. I showed 
pimted out to you the earth’s similar action on a pe: ‘eleo- 
“dle carried over its surface. I have evolved a current 0 
‘ticity from a magnet,by cutting with a closed conductor across 
