Mifcellanea Curiofa. 4.7 



Parts thereof, the Variation of the Needle gra- 

 dually decreafes ; but whether on the contrary 

 it increafes in thofe places which lie more We- 

 fterly than that Tracl: wherein the higheft Eaft 

 Variation is found , or how it may be in the 

 vaft Pacific^ Sea, we have not Experience e- 

 nough to afcertain, s 'only we may by Analogy in- 

 fer, that both the Eaft and Weft Variations there- 

 in do gradually increale and decreafe after the 

 feme Rule. 



Thefe Phenomena being well underllood and 

 duly confider'd, do Efficiently evince, That the 

 whole Magnetical Syftem is by one, or perhaps 

 more motions tranflated, whether Eaft wards or 

 Weftwards, I {hall anon difcufs j that this mo- 

 ving thing is very great, as extending its effects 

 from Pole to Pole, and that the motion thereof 

 is not per faltum, but a gradual and regular 

 motion. 



Now confidering the Structure of our Terra* 

 que ous Globe, it cannot be well fuppos'd that a 

 very great part thereof can move within ir, 

 without notably changing its Center of Gravi- 

 ty and the Equilibre of its Parts, which would 

 produce very wonderful Effects in changing the 

 Axis of diurnal "Rotation, and occafion ftrange 

 alteration in the Seas Surface, by Inundations 

 and Recedes thereof, fuch as Hiftory never yet 

 mention'd. Befides, the folid parrs of the 

 Earth are not , to be granted permeably by any 

 other than fluid Subftances, of which we know 

 none that are any ways Magnetical. So that 

 the only way to render this motion intelligible 

 and poflible, is to fuppofe it to turn about the 

 Center of the Globe, having its Center of Gra- 

 vity fix'd and immoveable in the fame common 

 Center of the Earth : And there is yet requir'd, 



that 



