xcn NOTES. 



Reaumur (6'8 Fah.) in a stratum 140000 French feet in thickness, and 

 heated to a state of fusion. 



( W9 ) p. 286. " The assumption, which has hitherto appeared so <=cure, of 

 the invariability of the force of gravity at any given point of the Earth's 

 surface, has become subject to some degree of uncertainty, since we have 

 become aware of the slow elevation of large districts" (Bessel iiber Maass 

 und Gewicht, in Schumacher's Jahrbuch fur 1840, S. 134). 



t 350 ) p. 287. Th. ii. (1810), S. 389. Compare Hallstrom, in Kongl. 

 Vetenskaps-Academiens Handlingar (Stockh.), 1823, p. 30; Lyell, in the 

 Phil. Trans, for 1835, p. 1; Blom (Amtmann in Budskerud), Stat. Besclir. 

 von Norwegen, 1843, S. 89 116. Previous to von Buch's publication of 

 his Scandinavian journey, but not previous to ihe journey itself, Playfair 

 surmised, in 1802, in the Illustrations of the Huttonian Theory, $ 393, that 

 it was the mainland of Sweden that was rising, not the sea that was sinking ; 

 and Keilhau has remarked (Om Lanjordens Stigning in Norge in dem Nyt 

 Magazin for Naturvidenskaberae), that the Dane Jessen had expressed such 

 & conjecture at a still earlier period. Their writings were, however, entirely 

 unknown to the great German geologist ; nor have they, so far as I am aware, 

 influenced the progress of physical geography on this point. In a work 

 entitled Kongeriget Norge fremstillet efter dets naturlige og borgerli^e Tilstand, 

 Kjobenh. 1763, Jessen has attempted to investigate the changes which have 

 taken place in the relative level in the coast and the sea, taking for bases the 

 early determinations of Celsius, Kalm, and Dalin. He shews some confusion 

 of ideas as to the possibility of increase by internal growth of the rocks which 

 form the coast, but at last declares himself in favour of the elevation of the 

 land as a consequence of earthquakes. " Although," he says, "'immediately 

 after the earthquake at Egersund no such elevation was perceived, yet the 

 earthquake may have opened the way for the action of other causes." 



(S 51 ) p. 287. Berzelius, Jahreshericht iiber di* Tortschrilte der physischen 

 "Wiss. No. 18, S. 686. The islands of Bornholm, and ot Saltholm opposite 

 to Copenhagen, rise, however, very little. Bornholm hardly rises one foot ia 

 a century. See Forchhammer, Phil Mag. Scries iii. Vol. ii. p. 309. 



C* 8 ) p. 287. Keilhau, in Nyt Mag. for Naturvid. 1832, Bd. i. pp. 105 

 254, Bd. ii. p. 57 , Bravais, " sur les lignes d'ancien niveau de la Mer," 1843, 

 pp. 15 40 Compare also Darwin on the Parallel Roads of Glen-Roy and 

 Lochaber, Phil. Trans. 1839, p. 60. 



P) p. 288. Humboldt, Asie centrale, T. ii. pp. 319324, T. iii. pp, 

 549 551. The depression of the Dead Sea has been successively investigated 



