48 MifceUanea Curiofa. 



that this moving internal Subftance be loofe 

 and detached from the external Parts of the 

 Earth whereon we live ; for otherwife, were it 

 affix'd thereto, the whole muft necefTarily move 

 together. 



So then the External Parts of the Globe may 

 well be reckon'd as the Shell, and the Inter- 

 nal as a Nucleus or inner Globe, included with- 

 in ours, with a*fluid Medium between, which 

 having the fame- Common Center and Axis of 

 diurnal Rotation, may turn about with our Earth 

 each twenty four Hours , only this outer Sphere 

 having its turbinating motion fbme fmall matter 

 either fwifter or flower than the internal Ball : 

 And a very minute Difference in length of time, 

 by many Repetitions becoming fenfible, the In- 

 ternal Parts will by degrees recede from the 

 External, and not keeping pace with one ano- 

 ther, will appear gradually to move either Eaft- 

 wards or Weft wards by the difference of their 

 motions. 



Now fuppofing fuch an Internal Sphere ha- 

 ving fuch a motion, we (hall fblve the two great 

 Difficulties we encountered in my former Hy* 

 thefis : For if this exteriour Shell of Earth be 

 a Magnet, having its Poles at a diftance from the 

 Poles of diurnal Rotation j and if the Internal 

 Nucleus be likewile a Magnet, having its Poles 

 in two other places, diftant alio from the Axis ; 

 and thefe latter by a gradual and flow motion 

 change their place in refpeel: of the External ; 

 we may then give a reafonable account of the 

 four Magnetical Poles I prefume to have demon- 

 ftratcd before ; as likewifejof the Changes of the 

 Needles Variations, which till now hath been un-> 

 attempted. 



The 



