you come to some Meridian of _Russia_, where 'twill be greatest, and from thence decrease again. Thus at _Brest_ the Variation is but 1¾ Degrees, at _London_ 4½ Degrees; but at _Dantzick_ seven Degrees West. To the Westward of the Meridian of the Lands-end, the Needle ought to have an Easterly Variation; were it not that (by approaching the _American_ Northern _Pole_, which lies on the West side of the Meridian, and seems to be of greater force than this other) the Needle is drawn thereby Westwards, so as to counterballance the Direction given by the _European Pole_, and to make a small West Variation in the Meridian of the Lands-end it self. Yet I suppose that about the Meridian of the Isle _Tercera_, our nearest _Pole_ may so far prevail as to give the Needle a little turn to the East, though but for a very small space: The Counterballance of those two _Poles_ permitting no considerable Variation in all the Eastern Parts of the _Atlantick_ Ocean; nor upon the West Coasts of _England_ and _Ireland_, _France_, _Spain_ and _Barbary_. But to the Westwards of the _Azores_ the Power of the _American_ Pole overcoming that of the _European_, the Needle has chiefly respect thereto, and turns still more and more towards it as you approach it. Whence it comes to pass, that on the Coast of _Virginia_, _New-England_, _New-found-Land_, and in _Hudson's-Straights_ the Variation is Westward; that it decreases as you go from thence towards _Europe_, and that it is less in _Virginia_ and _New-England_, than in _New-found-Land_, and _Hudson's-Straights_. This Westerly Variation again decreases, as you pass over the _North America_; and about the Meridian of the middle of _California_ the Needle again points due North; and from thence Westward to _Yedzo_ and _Japan_, I make no doubt but the Variation is Easterly, and half the Sea over no less than fifteen Degrees, if there be any truth in this Hypothesis of mine. Therefore I propose this as a Trial, that the whole may be scann'd thereby; and I conceive it will not be hard to know of the _Spaniards_ how it is, who so frequently sail through that Ocean, in their return from the _Manilha_ Isles. This East Variation extends over _Japan_, _Yedzo_, _East-Tartary_, and part of _China_, till it meet with the Westerly, which is govern'd by the _European_ North Pole, and which I said was greatest some where in _Russia_.