186 



changement d'inciinaison ne le comporte: donc du matiu au soir, 

 il y a une auymentation rielle d'intensile dans le magnelisrae 

 tcrrestre.a — ©pdtere unb »iel ja^lrei(^erc 95fobad^tungen in 

 ©reemuid), 58erlin, «Petersburg, Toronto (Sanaba) unb jgtobarton 

 (a3an 2)iemen) ^aben Slrago'ö 95e^auptung (1827) ber größeren 

 ^orijontttUSntenfitit am 2lbenb gegen ben 9}iorgen beftätigt. 

 3n ®reenuncf> ijl H6 jr)aupt = sD?arinium ber ^orijontalen Äraft 

 um 6°, brtS J^«upt--?Winimum um 22" ober ü"; in ©c^uljenborf 

 bei ^Berlin max. S-, min. 21"; in «Petersburg max. 8", min. 23" 

 20'; in 5£oronto max. 4", min. 23»: immer in ber ^eit jeben OxU. 

 (2lirj), Magn, Obscrv. at Greenwich for 1845 p. 13, for 

 1846 p. 102, for 1847 p. 241 ; (Rief unb SKofer in «poggenb. 

 3inn. i8b. XIX. 1830 ®. 175; Äupffer, Comple-rendu an- 

 nuel de l'Obs. central magn. de Sl. Petersb. 1852 p. 28 

 unb ©rtbine, Magn. Obs. at Toronto Vol. I. 18W)— 1842 

 p. XLII.) ©onberbar abreeic^enb, fafl entgegenfe^t, ftnb bie ^i&i- 

 fclflunben am 23orgebirge ber guten .^Öffnung unb auf @t. .^elena, 

 »0 am 2lbenb \>xt J^orijontalfraft am ü^wadjflcn ift (@tt= 

 bine, Magn. Obs. at the Cape of Good Hope p. XL; at 

 St. Helena p. 40). @o ift eS aber nidbt in ber ganjen füblic^en 

 ^emifp^äre weiter in Often. »The principal feature in the diurnal 

 change of the horizontal force at Hobarton is the decrease of 

 force in the iorenoon and its subsequent increase in the af- 

 lernoon« (Sabine, Magn. Obs. at Hobarton Vol. I. p. LIV, 

 Vol. II. p. XLIII). 



** (@. 104.) ©abinc, Hobarton Vol. I. p. LXVIl unb 

 LXIX. 



^^ (@. 107.) a;otal--3ntenfita"t in .^obarton: max. 5"'/,, 

 min. 20° '/j; in 2:oronto: ^aupt--sö?ai. 6", J?aupt^?Oiin. 14'; 

 fecunb. ?Otar. 20", fecunb. ?0?in, 22". 9Sergl. @abine, Toronto 

 Vol. I. p. LXI unb LXII mit Hobarton Vol. 1. p. LXVIII. 



" (@. 107.) Sabine, Report on the isoclinal and 

 isodynamic Lines in the British Islands 1839 p. 61—63. 



^"» (@. 108.) .^umbolbt in «poggenb. 9lnnaten 95b. XV. 

 ®. 319 — 336, 33b. XIX. ©. 357—391; unb im Voyage aux 

 Regions equinox. T. III. p. 616 unb 620. 



'* (@. 109.) ipanftcen ober jaljrlic^e «Beranberung 

 ber 3nclination in joggen b. «nn. 58b. XXI. S. 403— 429. 



