TERRESTRIAL MAGNETISM. 75 



them with the proper standards. The (no doubt) excellent 

 observations made by Fedoroff, in Siberia, are still unpub- 

 lished. 



1830 1845. Colonel Graham (of the topographical 

 engineers of the United States) : observations on the 

 magnetic force on the southern boundary of Canada. (Sabine, 

 in the Phil. Trans, for 1846, Pt. iii. p. 242). 



1830. Fuss : magnetic, astronomic, and hypsometric obser- 

 vations (Report of the Seventh Meeting of the Brit. Assoc* 

 1837, p. 497 499) on a journey from Lake Baikal 

 through Ergi Oude, Durma, and the. region of Gobi (which 

 is only about 2500 feet high), to Pekin, in order to 

 found there the magnetical and meteorological observatory 

 in which Kovanko has observed for ten years. (Humboldt, 

 Asie centrale, T. i. p. 8 ; T. ii. p. 141 ; T. iii. pp. 468 and 

 477.) 



1831 1836. Captain Fitz Eoy, in a voyage of circum- 

 navigation in the ' Beagle/ as well as in the survey of the 

 coasts of the southern extremity of America ; observations 

 with a Garabey's Inclinatorium, and horizontal needles 

 received from Hansteen. 



1831. Dunlop, Director of the Astronomical Observa- 

 tory of Paramatta : observations on a Voyage to Australia, 

 (Phil. Trans, for 1840, Pt. i. p. 133140). 



1831. Faraday's Induction-currents, the theory of which 

 has been extended by Nobili and Antinori ; great discovery 

 of the production of light by magnets. 



1833 and 1839 are the two important epochs of the first 

 promulgation of the theoretical views of Gauss: 1. Intensitas 

 vis magneticse terrestris ad mensuram absolutam revocata, 

 1833 (p. 3, "elementum tertium, intensitas, usque ad 



