xlvi NOTES. 



boules terminates des deux conducteurs e'lectriques se partage en tranches nom 

 breuses et paralleles, se'parees par des couches obscures alternantes, et rdguliere- 

 ment distinctes." (Comptes rendus de 1'Acad. des Sciences, t. xxxv. 1852, 

 p. 949.) 



( 20S ) p. 155. Voyages en Scandinavie (aurores bor.), p. 558. On auroral 

 coronas and canopies, see the excellent Accounts and Inquiries by Bravais, p. 

 502514. 



( 209 ) p. 155. Same work (draperie ondulante, flamme d'un navire de guerre 

 cleploye'e horizontalement et agLtee par le vent, crochets, fragments d'arcs et de 

 guirlandes), p. 35, 37, 45, 67, and 481. Mr. Bevalet, the distinguished artist 

 of the expedition, has furnished an interesting collection of drawings of the 

 various forms. 



( 21 ) p. 155. Compare Voy. en Scand. (aur. bor.), p. 523 to 528 and 557. 



( 2n ) p. 156. Kosmos, Bd. i. S. 201 and 441, Anm. 44 (English edition, 

 p. 182, 183, and Note 174). Compare Franklin, Narrative of a Journey to 

 the Shores of the Polar Sea in 1819 1822, p. 597; and Kamtz, Lehrbuch der 

 Meteorologie, Bd. iii. (1836) S. 488490. The oldest conjectures respecting 

 a connection between the aurora and the formation of clouds, are probably those 

 of Frobesius. (See Auroras Borealis Spectacula, Helmst. 1739, p. 139.) 



( 2I2 ) p. 156. I take a single example from my manuscript journal in my 

 Siberian journey. "The night of the | th August (1829) was passed by me 

 in the open air, separated from my travelling companions, at the Cossack post 

 of Krasnaia larki, the most eastern one on the Irtysch, and on the boundary of 

 Chinese Dzungarei, and therefore of some importance as regards astronomical 

 determination of latitude and longitude. The night was extremely clear. Before 

 midnight, there suddenly formed, on the eastern part of the heavens, polar bands 

 of cirrus (' de petits moutons e'galement espace's, distribues en bandes paralleles 

 et polaires '). Greatest altitude 35; the northern point of convergence moving 

 slowly towards the east. They disappeared without reaching the zenith, and a 

 few minutes afterwards similar bands of cirrus appeared on the north-eastern 

 part of the sky. During the greater part of the remainder of the night, almost 

 until sunrise, they again moved in a very regular manner to N. 70 E. There 

 were an unusual number of shooting stars in the course of the night, and coloured 

 halos round the moon. There were no traces of aurora proper. A little rain 

 fell with feathery clouds ; in the forenoon of the 6th the sky was again clear, 

 and fresh polar bands were formed, and remained without moving or altering 

 their azimuth, from N.N.E. to S.S.W., as I had often seen in Quito and in 

 Mexico." (The magnetic declination is easterly.) 



( 2ls ) p. 156. Bravais, who, contrary to my experience, almost always found 



