TEERESTIUAL MAGNETISM. 



south of the coast and north of the town of Caracas, 

 incl. 41-90 : La Guayra, elev. 10 feet; incl. 42'20 ; town 

 of Caracas, elev. 2484 French feet; incl. 42'95. (Hum- 

 boldt, Yoy. aux Kegions equinox. T. i. p. 612.) 



Santa Fe de Bogota: Elev. 8196 French feet; incl. 

 27'15 : Chapel de Nuestra Senora de Guadalupe, on a 

 precipice above the town, elev. 10128 French feet; incl. 

 26-80. 



Popayan : Elev. 5466 French feet ; incl. 23'25 : moun- 

 tain village of Purace, on the declivity of the volcano, 

 elev. 8136 French feet; incl. 21'80 : summit of the vol- 

 cano of Purace, elev. 13650 French feet; incl. 20'30. 



Quito: Elev. 8952 French feet; incl. 14'S5 : San 

 Antonio de Lulumbamba, where the geographical equator 

 passes through the hot valley ; elev* of the bottom of the 

 valley, 7650 French feet; incl. 16'02. All the above 

 inclinations are given, as observed, in centesimal degrees, as 

 their comparative value is the only point under consideration. 



On account of the too great horizontal distances between 

 the stations, and the influence of adjacent rocks, I do not- 

 lay aoy stress on my European observations : as, for example, 

 at the Hospice on St. Gothard (6650 French feet), incl. 

 66 12 / ,compared to Airolo (3502 French feet),incl. 66 54', 

 and Altorf, incl. 66 55'; or (which seem to tell the other 

 way) Lans le Bourg, incl. 66 9'; Hospice on Mount Cenis 

 (6358 French feet), incl. 66 22'; arid Turin (707 French 

 feet), incl. 66 3' ; or at Naples, Portici, and the crater of 

 "Vesuvius ; or in Bohemia, the summit of the great Mili- 

 schauer (a Phonolite !), incl. 6753'; Toplitz, incl. 6719''5; 

 and Prague, incl. 66 47''6.( 144 ) In 1844 Bravais, in 

 company with Martins and Lepileur, made a series of 



