At _London_, in the Year 1580, the Variation was observ'd by Mr. _Burrows_ to be 11° 15' East. In _Anno_ 1622, the same was found by Mr. _Gunter_ to be but 6° 0' East. In the Year 1634, Mr. _Gellibrand_ found it 4° 5' East. In 1657, Mr. _Bond_ observ'd that there was no Variation at _London_. _Anno_ 1672, my self observ'd it 2° 30' to the West; and in the Year 1692, I again found it 6° 00' West. So that in 112 Years the Direction of the Needle has chang'd no less than seventeen Degrees. At _Paris_, _Orontius Finæus_ about the Year 1550, did account it about eight or nine Degrees East Variation. _Anno_ 1640, it was found three Degrees East. _Anno_ 1660, there was no Variation there, and _Anno_ 1681, I found it to be 2° 30' to the West. At _Cape d' Agulhas_, the most Southerly Promontary of _Africa_, about the Year 1600, the Needle pointed due North and South without Variation, whence the _Portugueze_ gave its name. _Anno_ 1622, there was two Degrees West Variation. _Anno_ 1675, it was 8° 50' West; and in the Year 1691, it was curiously observ'd not less than eleven Degrees West. At St. _Helena_, about the Year 1600, the Needle declin'd eight Degrees to the East. _Anno_ 1623, it was but 6° 0' East. _Anno_ 1677, when I was there, I observ'd it accurately on Shoar to be 0° 40' East; and in 1692 it was found about 1° to the Westward of the North. At _Cape Comorine_ in _India_, in the Year 1620, there was 14° 20' West Variation. In the Year 1680, there was 8° 48', but now lately in the Year 1688, it was no more than 7° 30', so that here the Needle has return'd to the East about seven Degrees in seventy Years.