332 Prof. E. Loomis on the Aurora of 1859. 
The following table shows the latitude mS longitude of the 
places mentioned in the preceding catalogu 
Station. Latitude. | ie eveeich | ‘Station Latitude. vnaeaiiice 
Petersburgh, 59° 56’ | 30° 18’ E. || Leipsic, 51° 20’ | 19° 29' B 
Christiania, 59 54 110 44 Breslau, 61° 6 ties 
Upsala, 59 51 {17 88 Freiberg, 50 65 | 18 20 
Stockholm, 59°20 Pigs Brussels, 50 51 4 22 
Copenh 55 40 | 12 85 E. Marburg, 50 48 8 41 
Makerstoun, 55 36 Par WF, ague, 0 5 | 14 25 
Seeburg, 53 56 | 20 45 E. wv, 3 | 19 58 
Altona, 58 82 9 56 E. || Heidelberg, 49 28 8 42 
Dublin, 53 23 | 6 20 W. burg, 48 21 | 10 53 
Berlin, 52 80 | 18 24 E. || Munich, 48 8 | 11 387 
Hague, 52 4 | 4 19 Kremsmiinster,| 48 38 | 14 8 
Breda, 51 35 4 47 eneva, 46 il 
Gottingen, 51 81 9 57 Milan, 45 28 } 9 12 B 
Greenwich, 51 28 0 0 
instant as at t Gatingen and in how many cases it awe 
later than at Gottinge 
AD deviation of the magnetic needle. 
Sarlier. | Fimulte-| rater. Earlier. | 2BBN2 | Later 
Petersburgh, 9 3 2 ||Munich, 8 0 13 
Christiania, | 1 8 0 ||Kremsmunster| 1 he oe 
13 on 1 ||Hague, 0 Ee gs 
Stockholm, 5 4 0 ||Breda, 4 21 , 
Copenhagen, q 17 0 |/Brussels, 0 4 pitas 
eeburg, 0 1 0. ||Marburg, 0 31 8 
Altona, 0 3 0 |\|Augsburg, 0 $ . 
Berlin, 3 36 1 |\Geneva 0 2 . 
Leipsic, 2 89 1 ilan, 0 30 7 
Breslau, 4 84 1 |\Makerstoun, 0 1 1 
Freiberg, 0 9 0 ublin, 1 1 9 
Cracow, 1 9 0 ||Greenwich, 0 1 . 
e, ] 12 1 
From this table we perceive that at most of the ‘stations, 8, the 
maximum deviation generally occurred simultaneously ; that is, 
within a period of five minutes, for this is the interval of time 
others it ge maerally occurred later than at Gittingen. If we cs 
throu Ottin 2 a great circle of the earth running from . 
60° W. to S. 60 it aval divide the stations in such a manner, 
that at all Pyadtng on “he N.E. side of this line, sl maximum 
occurs earlier more frequently than later; while m 
on the 8S. W. side of it, the maximum occurs later more So frequent 
than earlier. We may then conclude that the maximum 
ation of the’ magnetic needle advances pro essively like @ W 
over the earth’s surface; and that the direction of its mo otion } 
nearly from N.E. to . W. 
