NOTES. XX111 



(**) p. 89. Kosmos, Bd. iii. S. 402 (English edition, p. 292). 

 C 85 ) p. 89. Kosmos, Bd. iii. S. 238 (English edition, p. 158). 

 ( M ) p. 90. Kreil, Einfluss des Mondes auf die magnetische Declination, 

 1852, S. 27, 29 and 46. 



( 87 ) p. 91. Kosmos, Bd. i. S. 407, Anm. 55, and, in regard to meteoric 

 stones, S. 137; also Bd. iii. S. 594 (English edition, Vol. i. Note 85, and p. 

 122; Vol. iii. p. 421). 



( 88 ) p. 92. Compare Mrs. Somerville, in her brief but lucid representation of 

 terrestrial magnetism, founded on Sabine's writings, in vol. ii. p. 102 of her 

 Physical Geography (2nd edition). Sir James Koss, who, on his great antarctic 

 expedition, crossed this curve of weakest force, December, 1839, lat. 19 S., and 

 long. 29 13' W., and who has the great merit of having been the first to deter- 

 mine its place in the southern hemisphere, terms it the " equator of least in- 

 tensity." See his Voyage to the Southern and' Antarctic Regions, vol. i. 

 p. 22. 



(") p. 92. " Stations of an intermediate character situated between the 

 northern and southern magnetic hemispheres, partaking, although in opposite 

 seasons, of those contrary features which separately prevail (in the two hemi- 

 spheres) throughout the year." Sabine, in the Phil. Trans, for 1847, Pt. I. 

 p. 53 and 57. 



(") p. 93. The Pole of Intensity of Force is not the Pole of Verticity. 

 (Phil. Trans, for 1846, Pt. III. p. 255.) 



( 9I ) p. 93. Gauss, allgem. Theorie des Erdmagnetismus, 31. 



( ffi ) p. 94. Phil. Trans, vol. xxxiii. for 1724, 1725, p. 332 ("to try if 

 the dip and vibrations were constant and regular "). 



( 93 ) p. 94. Novi Comment. Acad. Scient. Petropol. t. xiv. pro anno 1769, 

 Pars II. p. 33. See also Le Monnier, Lois du Magrietisme compare'es aux Ob- 

 servations, 1776, p. 50. 



( M ) p. 95. The sign + prefixed to a latitude signifies " North," and the 

 sign - " South" [In this translation the words North and South, or the letters 

 N. and S., are employed for the same purpose. Ed.] ; and East and West signify 

 East and West longitude from Paris, unless otherwise stated. [In this translation, 

 on the other hand, East and West, or E. and W., signify East or West longitude 

 from Greenwich, unless otherwise stated. Ed.] In the section on Terrestrial 

 Magnetism, from p. 80 to p. 153, wherever marks of quotation (" ") occur with- 

 out any particular memoir of Colonel Sabine's being expressly referred to, either 

 in the text or in the notes, it is to be understood that the passage is taken from 

 my friend's manuscript communications to myself. 



( 95 ) p. 96. Fifth Eeport of the British Association, p. 72; Seventh Report, 



