In all the other Examples the Needle has gradually mov'd towards the West, and the places are too far asunder to be influenc'd by the removal of any Magnetical Matter, which may by accident be transplac'd within the Bowels, or on the Surface of the Earth. If more Examples are desir'd, the Reader may be furnished with them in the _Portugueze Routier_ of _Aleixo de Motta_ (written about the Year 1600) and in the Voyage of _Beaulieu_, both publish'd in Mr. _Thevenot_'s first Collection of curious Voyages, Printed at _Paris_, _Anno_ 1663; which he is to compare with the Journals of our late _East India_ Voyagers, and I am assur'd, that it will be thereby evident, that the Direction of the Needle is in no place fix'd and constant, tho' in some it change faster than in others: And where for a long time it has continu'd as it were unalter'd, it is there to be understood, that the Needle has its greatest Deflection, and is become Stationary in order to return, like the Sun, in the Tropick. This, at present, is in the _Indian Sea_, about the Island _Mauritius_, where is the highest West Variation, and in a Tract tending from thence into the N. N. W. towards the _Red-Sea_ and _Egypt_. And in all Places to the Westward of this Tract, all over _Africa_ and the Seas adjoining, the West Variation will be found to have encreas'd; and to the Eastwards thereof as in the Example of _Cape Comorine_, to have decreased, _viz._ all over the _East-Indies_, and the Islands near it. After the like manner in that Space of East Variation, which, beginning near St. _Helena_, is found all over the South _America_, and which at present is highest about the Mouth of _Rio de la Plata_, it has been observ'd, that in the Eastern Parts thereof, the Variation of the Needle gradually decreases; but whether on the contrary it increases in those places which lie more Westerly than that Tract wherein the highest East Variation is found; or how it may be in the vast _Pacifick Sea_, we have not Experience enough to ascertain, only we may by Analogy infer, that both the East and West Variations therein do gradually increase and decrease after the same Rule. These _Phænomena_ being well understood and duly consider'd, do sufficiently evince, That the whole Magnetical System is by one, or perhaps more motions translated, whether Eastwards or Westwards, I shall anon discuss; that this moving thing is very great, as extending its effects from Pole to Pole, and that the motion thereof is not _per saltum_, but a gradual and regular motion.