1835.] Poggendorff^s Annalen dei" Physik, ^c. 



385 



ous data, that the magnetic intensity of the earth is situated on its 

 surface. He follows up the subject in the present paper. He con- 

 siders as demonstrated, that the magnetic distribution over the earth 

 is proportional to the line of its breadth, and calculates the inclination 

 and intensity. He also discusses the theoretical grounds from which 

 the temperature of the earth has been calculated Ipy mathematicians. 

 He calculates the intensity to be in 54o 42' 50 ' N. L., 1 -6937, and 

 the inclination ']\o 8' 20 . The mean temperature of the northern 

 hemisphere he finds 15° R. (nr)«|) in the 30th" of latitude. That of 

 the southern hemisphere is 63o*34. 



Mas:netic iiijluence produced by the Electrical Machine. — M. 

 Llambias, of Port Mahon, in a communication to the Academy of 

 Paris, observes that magnetism can be developed in this way. The 

 two electrical currents in a metallic conductor discharged from a 

 Leyden jar, may be separated, at least, in part, by having the con- 

 ductor adjusted so as to separate into two or more arms, and by 

 having an interruption in one of these arms, which gives origin to a 

 spark in any arc or part of the same, where the two currents unite in 

 passing through ; it is in general the positive stream (that proceeding 

 from the positive to the negative pole) which contracts the power of 

 communicating the magnetic influence. 



List of earthquakes^ volcanic erruptions, and remarkable 

 meteoric appearances since the year 1821, by K. E. A. v. Hoff, 

 9th part. — This forms the concluding portion of an important list of 

 meteoric phenomena, registered with considerable minuteness. It 

 terminates with a summary exhibited in the following tables, com- 

 prehending 10 years, from 1821 to 1830: — 



January . 

 February . 

 March 



April 

 May 

 June 



July . . 

 August . 

 September 



October . 

 November 

 December 



Total 



VOL. II. 



