282 Miscellaneous Intelligence. 
duce a very great secondary current; but may it not be sufficient 
to account for the lunar-diurnal magnetic variation, which is also 
very small ? 
Such a current taking place in a conductor electrically connected 
with the earth’s upper surface ought to be felt by the Greenwich 
wires ; and, if I am not mistaken, Dr, Airy has detected a current 
of this nature. 
a constant core? And might not an aurora of the latter kind in- 
dicate the approach of a change of weather ? 
These remarks are thrown out in order to invite comment and 
criticism, and they will have served their purpose if they direct 
attention to the part that may be played by moving conductors In 
the phenomena of terestrial magnetism. It will be noticed that 
these remarks do not touch upon the mysterious connection be- 
lieved to exist between magnetic disturbances and the frequency 
of solar spots. 
P. 8.—Si 
may play a part in the phenomena of terrestrial magnetism.— 
Monthly Notice of the Royal Astronomical Society, Dec. 10th, 
1869.— Phil. Mag., IV, xxxix, 159 
property occurring annually on our Great Lakes, and suggesting 
the possibility of doing something to prevent at least a in of 
d on. 
this loss in futur ill was at once introduced by H albert 
E. Paine, of Wisconsin, providing that the Secretary of War be at ' 
ize quired to provide for taking the necessary meteoro 
tic coast, by means of the electric telegraph, of the approach and 
force of storms. Letters were subsequentl presented to the 
ives, Feb. 2, and in the Senate Feb. 4, 1870. The 
of the bill as adopted :— 
ete., That the Secretary of War be and he 
d required to provide for taki 
and for giving notice on the northern lakes 
