NOTES. xli 



" Plusieurs sortes d'ondes pcavent se croiser dans 1'eau comme dans Pair; les 

 petits mouvements se superposent" Compare Lament's conjectures on the 

 compound action of a polar and an equatorial wave, in Poggend. Annalen, Bd. 

 Ixxxiv. S. 583. 



( 176 ) p. 141. See above, p. 138, Note 169. 



( 177 ) p. 142. Sabine, in the Phil. Trans, for 1852, Pt. II. p. 110; Young- 

 husband, in the before-quoted work, p. 169. 



( 178 ) p. 142. According to Lamont and Eelshuber, the magnetic period is 

 10^ years; so that the amount of the mean diurnal movement of the needle 

 would continually increase for five, and decrease for five years ; the winter move- 

 ment (or amplitude of the declination) being little more than half as great as 

 that of the summer months. (Compare Lamont, Jahresbericht der Sternwarte zu 

 Munchen fur 1852, S. 5460.) The director of the Berne Observatory, Eudolph 

 Wolf, finds, by an enquiry extending over a much longer space of time, a con- 

 current period of the magnetic declination and of the frequency of the solar spots 

 of ITl years. 



( lre ) p. 142. Kosmos, Bd. iv. S. 74, 75 (Anm. 73), 77, 80, and 81 (English 

 edition, p. 80, 81 (Note 73), 85, 88, and 89). 



( I8e ) p. 142. Sabine, in the Phil. Trans, for 1852, Pt. I. p. 103 and 121. 

 Compare, besides the memoir of Rud. Wolfs, already referred to (present volume, 

 p. 81), of July 1852, and similar conjectures published, almost at the same time, 

 by Gautier, in the Bibliotheque Universelle de Geneve, t. xx. p. 189. 



( 181 ) p. 143. Kosmos, Bd. iii. S. 401403 (English edition, p. 291293). 



( I32 ) p. 143. Sabine, in the Phil. Trans, for 1850, Pt. I. p. 216. (Faraday, 

 Exper. Researches on Electricity, 1851, p. 56, 73, and 76; 2891, 2949, and 

 2958.) 



183 ) p. 143. Kosmos, Bd. i. S. 185 and 427, Anm. 13 (English edition, 

 p. 168 and Note 143); Poggend. Annalen, Bd. .xv. S. 334 and 335; Sa- 

 bine, Unusual Disturb, vol. i. Pt, I. p. xiv xviii., where are given tables of 

 simultaneous storms at Toronto, Prague, and Hobarton. On days when the 

 magnetic storms were most violent in Canada (22nd March, 10th May, 6th 

 Aug., and 25th Sept., 1841), similar phenomena showed themselves in the 

 southern hemisphere. Compare also Sir Edward Belcher, in the Phil. Trans, for 

 1843, p. 133. 



( 18t ) p. 144. Kosmos, Bd. i. S. 219 (English edition, p. 199). 



( 18S ) p. 145. Kosmos, Bd. i. S. 188, 189, and 430, Anm. 2022 (English 

 edition, p. 171 and Notes 150 152); Bd. ii. S. 319321 and 482. Anm. 

 93 and 94 (English edition, p. 282 and 283, Notes 434 and 435); Bd. iv. 

 S. 5160 (English edition, p. 5262). 



