294 Miscellaneous Intelligence. 
IVY. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
1. Letter from Prof. Aue. De 1a Rive respecting the paper of Mr. 
B.V. Marsh, on the Aurora, viewed as an electric discharge. “ Monsieur 
Silliman, Editor of the American Journal of Science and Arts:—Sir: No. 
Later, in the third volume of my Treatise on Electricity.t published — 
co - 
is 
ere. When ig to favoring circumstances this intensity : 
ich in ret 
dering them visible, constitutes the Aurora Borealis, 
—s i ey the fre 
_ almost daily, in the polar region. As appears from the observatio 
Messrs. Loitin and Bravais, “ prand 
2 ; ~ _ <a cm. * lea 
Tome xxv, p. 310. “Sur les variations diurnes de L’Aiguille Aimantée 
- Autrores Borésles.”” + Tome xxix, p. 412, $ Vol. II, p. 283. 
ic aed 
