76 TERRESTRIAL MAGNETISM. 



tempora recentiora penitus neglectum mansit") ; 2. The 

 immortal work, Allgemeine Theorie des Erdmagnetismus, 

 in the Resultate aus den Beobachtungen des magnetischen 

 Vereins im Jahr 1838, herausgegeben von Gauss und Weber, 

 1839, S. 157, (General Theory of Terrestrial Magnetism, 

 published in English in Vol. ii. of the Scientific Memoirs, 

 p. 184251; and Supp. Yol. ii. p. 313317). 



] 833. Barlow's investigations on the attraction of ships' 

 iron, and the means of determining its deflecting influence 

 on the compass ; examination of electro-magnetic currents 

 in " Terellas." General Maps of the Declination. (Compare 

 Barlow's " Essay on Magnetic Attraction," 1833, p. 89, 

 with Poisson, " sur les deviations de la boussole produites 

 par le fer des vaiseaux," in the Mem. de 1'Institut, T. xvi. p. 

 481555; Airy, in the Phil. Trans, for 1839, Pt. i. p. 167, 

 and for 1843, Pt. ii. p. 146 ; Sabine, in the account of Sir 

 James Ross's observations, in the Phil. Trans, for 1849 

 Pt.ii. p. 177 195.) 



1833. Moser, in PoggendorfFs Annalen, Bd. ii. S. 53 

 64, on a method of ascertaining the position and force of 

 the variable magnetic poles. 



1833. Christie on the Arctic observations of Captain 

 Back, Phil. Trans, for 1836, Pt. ii. p. 377. See also his 

 earlier and important Memoir in the Phil. Trans, for 1825, 

 Pt. i. p. 26. 



1834. Parrot's Eeise nach dem Ararat (Journey to Mount 

 Ararat), Magnetismus, Bd. ii. S. 33 64. 



1836. Major Estcourt in Colonel Chesney's Euphrates 

 expedition. A part of the Force observations was lost in 

 the steamer ' Tigris,' a circumstance which is the more to 

 be regretted because there is so entire an absence of exact 



