j 4 3 A Tretiifs ^/BODIES. Chap. ir. 



in the former part of the Problcmc, betwixt a fecond iron and 

 n loadftone, it is fupplyedby the foriner rcafbn which \ve gave 

 for that particular purpose. 



The third cafe depended) al(b of this folution; for the biggtc 

 a:i iron is, fo n.any more parts it hath to luck up the influence 

 of the loadftone ; and confequently, doth it thereby the more 

 greedily : and thcrefarc the loadftone muft be carried to ic more 

 violently, and when they are joy ned (tick more ftrongly. 

 p. The fixth queftion is, Why the variations of the needle from 



why 'hera^a the true north in the northern hemifpherc, are greater the near- 

 cdnee<?!eftom er you go to the pole , and lefTer the nearer you approch to the 

 tb i$ equator. The reafon whereof is plain in our doftrine; fur con- 

 ou'o fideringthat the rnagnecick virtue of the earth, ttreamcth from 

 t h c north towards the equator; it followeth of neceflny, that ir" 

 there be two flreams of magnctick fluours ifluing fro the north, 

 one of them preciiely from the pole, and the other from a pare 

 of the earth near the pole; and that the ftream coming from the 

 point by fide the pole, be but a little the Stronger of the two; 

 v there will appear very little dirTerencies in their fcverall opera- 

 tions, after they have had a long /pace to mingle their emanati- 

 ons together; which thereby do joynand grow as ic were into 

 ftream. Whereas the nearer you come to the pole, the more you 

 will find them fevered, and each of them working by its own 

 virtue. And very near the point which caufeth the variation, 

 each ftream worketh fingly by it felf ; and therefore here the 

 point of variation mutt be matter , and will carry the needle 

 ftrongly unto his courfe from the due north, if his itream be 

 never ib little more efficacious then the other. 



Again, .a line drawn from a point of the earth wide of the 

 pole, to a point of the meridian near the equator, makcth a lefle 

 angle, then a line drawn from the fame point of the earth, to a 

 point of the fame meridian nearer the pole: wherefore the varU 

 ation being eftectned by the quantities of the faid angles, it 

 muft needs be greater near the pole, then near the equator, 

 though the caufe be the fame. 



Which a lictle figure will prefendy explicate. Let the poinc 

 A, be the pole; amfchc line A B, the meridian j and the point 

 B the intersection of it, with a parallel near the equator; and 

 thc.poimC the iuterfc&ion of the- meridian, vvich the Tro- 



pick;. 



