Prof. Cornette on the Aurora of 1859. 401 
(Aug.) the normal course of diurnal declination was scarcely 
recognizable and consequently I have followed it with the more 
interest. This disordered movement reached its maximum of 
29th, and last evening (September Ist) the declination had grad- 
ually diminished. 
was there much diffused purple light. The same cause had pro- 
duced the same effect, since that moment, (which does not coin- 
The purple light extended from the north on ct night of 
conclusion that the opposed aerial movement reigned simultane- 
ously in the atmosphere and developed in the air electric tension, 
_- that a calm followed the struggle, and that the Aurora Borealis 
happened during a calm, they would have made a glorious con- 
uest fi i 
: But pas ‘See remain yet to be observed. No Aurora Bo- 
realis appeared to me in the equinoctial regions as far as lat. 
20° from 1847 to 1857. The first which I saw—at Troy, N. Y., 
SECOND SERIES, Voz. XXVIII, No. 84.—NOV., 1859. 
51 
