Miscellaneous Intelligence. 281 
2. On Auroral appearances and their connection with the phe- 
nomena of Terrestial Magnetism; by Batrour Stewart, F.R.S. 
F.R.A.S, years since, I ventured to suggest that au- 
roral displays might be secondary currents due to small but rapid 
changes, caused by some unknown influence, in the magnetism of 
the earth. In developing this idea, the earth was compared to the 
core of a Ruhmkorff machine, and the moist upper strata of the 
s 
g f wer to this, let us reflect what 
takes place at uator. When once the anti-trades have 
? . . 
esides the anti-trades there are pot no miter pee agar 
rents, © rogress of the sun, taking | 
othe Piet rs ‘a ay not also be 
, would not be felt by the earth 
and I think Mr. Airy has noticed 
wave represents a motion 0 t 
face, with dnc patios in one lunar day. This motion cannot pro- 
