Tho' I could wish we could obtain from the _Spaniards_ what Variations they find in their Voyages from the _Manilhas_ towards _Acapulco_, through the North part of the South Sea; as likewise what it is at _Japan_ from the _Dutch_: Yet (considering the number of these Observations I have collected, and that they are made in parts of the World so remote from _Europe_, and from one another) I suppose that the Theory that answers these will scarce fail in those Regions from whence we have as yet no account. But first we must make some Remarks upon the foregoing Table: And, First, That in all _Europe_ the Variation at this time is West, and more in the Eastern Parts thereof than the Western: As likewise, that it seems throughout to be upon the increase that way. Secondly, That on the Coast of _America_, about _Virginia_, _New-England_ and _New-Foundland_, the Variation is likewise Westerly; and that it increases all the way as you go Northerly along the Coast, so as to be above 20 Degrees at _New-Found-Land_, nearly 30 gr. in _Hudson's Straights_, and not less than 57 Degrees in _Baffin's Bay_; also, that as you Sail Eastward from this Coast, the Variation diminishes. From these two it is a Legitimate Corollary: That _Somewhere between_ Europe, _and the North part of_ America, _there ought to be an Easterly Variation, or at least no Westerly_. And so I conjecture it is about the Eastermost of the _Tercera Islands_. Thirdly, That on the Coast of _Brasile_ there is East Variation, which increases very notably as you go to the Southward, so as to be 12 Degrees at _Cape Frio_, and over against the River of _Plate_ 20½ Degrees: And from thence Sailing South-Westerly to the Straits of _Magellan_ it decreases 17 Degrees, and at the West Entrance but 14 Degrees. Fourthly, That at the Eastward of _Brasile_, properly so call'd, this Easterly Variation decreases, so as to be very little at St. _Helena_ and _Ascension_, and to be quite gone, and the Compass Point true about 18 Degrees of Longitude West from the Cape of _Good-hope_. Fifthly, That to the Eastward of the aforesaid Places a Westward Variation begins, which Reigns in the whole _Indian_ Sea, and arises to no less than Eighteen Degrees under the Equator it self, about the Meridian of the Northern part of _Madagascar_; and near the same Meridian, but in 39 Degrees South Latitude it is found full 27½ Degrees: From thence Easterly the West Variation decreases, so as to be little more than eight Degrees at _Cape Comorin_, and than three Degrees upon the Coast of _Java_; and to be quite extinct about the _Molucca Islands_, as also a little to the Westwards of _Van Diemens_ Land found out by the _Dutch_ in 1642.