374 Foreign and Miscellaneous Intelligence. 



is altogether rocky, and is prolonged from N.W. to S.E., is a cir- 

 cumstance in favour of the parallelism of the direction of the strata 

 and the magnetic curve. 



Other curves, examined in a similar way, offered similar analogies ; 

 and it may be observed generally, that, in western Europe, the 

 magnetic curves of equal intensity, and the stratification, have both 

 a north-eastern direction ; whilst in eastern Europe they both have a 

 north-westerly direction. 



That there are anomalies M. Necker admits, and notes amongst 

 them the Pyrenees in western Europe ; the part of eastern Europe 

 which, comprehending Styria, includes the mountainous portions to 

 the west and south-west of Vienna and the north-west of Hungary ; 

 and the various groups, consisting of central masses of granite, 

 clothed with mantles of stratified rocks. 



The investigation is then carried on in North America, in Mexico, 

 and in Asia, where, as far as the present state of geological know- 

 ledge will admit, the same general relations are observed. The 

 longest chain of mountains in the world, namely, the Hymalaya, are 

 found to coincide in direction perfectly with the magnetic curve. 



Although the account of these analogies and directions is very 

 incomplete, still M. Necker thinks it will be difficult to deny the 

 existence of a relation between the stratification of the earth, the 

 direction of the principal mountainous chains, the elevation of the 

 continents, and the curves of equal magnetic intensity ; and he thinks 

 it must be a point of no small interest to the geologist, to observe 

 the regular manner in which the mountains and mineral masses of 

 the earth arrange themselves symmetrically about the two points of 

 the northern hemisphere, which are nearly in the same places where 

 Professor Hansteen and Captain Sabine have recognised the two 

 poles of equal magnetic intensity*. 



8. FORCE OF TERRESTRIAL MAGNETISM. 



The following Table of the intensity of the earth's magnetic force 

 at certain places on the continent, is from the recent observations of 

 M. Quetelet, of Brussels, who was supplied with every facility of 

 determining these intensities with accuracy : 



Mean horizontal 



Place of Duration of intensity, that Magnetic Total 



Observation. 100 oscillations of Altona Inclination. Intensity, 



of the Needle. being 1. 



Berlin 39P.13 1.0301 68 .42' 2.836 



Gottingen . . . 390 .72 1.0310 68 .39 2.832 



Leipsic 386 .72 1.0524 58 . 8.2 2.827 



Dresden 382 .53 1.0756 67 .41.3 2.833 



Brussels 392 .13 1.0245 68 .56.5 2.851 



Frankfort.... 385 .16 1.0614 67 .52 2.816 



The places are arranged in the order of their latitudes, being 



Bull. Univ. 1830, p. 166. 



