In 1637 Henry Bond wrote in the _Sea-Mans Kalendar_ that in the year 1657 the variation would be zero at London. Compare Bond's _Longitude Found_ (Lond., 1676, p. 3).
As to inconstancy of the variation in one place see further Fournier's _Hydrographie_ (Paris, 1667, liv. xi., ch. 12, p. 413), and Kircher, _Magnes_ (Colon. Agripp., 1643, p. 418).
[220] PAGE 157, LINE 4. Page 157, line 5. _perfecto._--Though this word is thus in all editions, it ought to stand _perfectâ_, as in line 10 below.
[221] PAGE 157, LINE 11. Page 157, line 13. _varietas_, for _variatio_.
[222] PAGE 160, LINE 20. Page 160, line 23. _in Borrholybicum._--This name for the North-west, or North-North-West, is rarely used. It is found on the chart or windrose of the names of the winds on pp. 151 and 152 of the _Mécometrie de l'Eyman_ of G. Nautonier (1602). Here the name _Borrolybicus_ is given as a synonym for _Nortouest Galerne_, or [Greek: Olumpias], while the two winds on the points next on the western and northern sides respectively are called _Upocorus_ and _Upocircius_.
{ 56} In Swan's _Specvlvm Mundi_ (Camb., 1643, p. 174) is this explanation: "Borrholybicus is the North-west wind."
In Kircher's _Magnes_ (Colon. Agripp., 1643, p. 434) is a table of the names of the thirty-two winds in six languages, where _Borrolybicus_ is given as the equivalent of _Maestro_ or _North-West_.
[223] PAGE 161, LINE 2. Page 161, line 2. _Insula in Oceano variationem non mutat._--The conclusions derived from the magnetic explorations of the Challenger expedition, 1873-1876, are briefly these: That in islands north of the magnetic equator there is a tendency to produce a local perturbation, attracting the north-seeking end of the needle downwards, and horizontally towards the higher parts of the land; while south of the magnetic equator, the opposite effects are observed. (See _Challenger Reports, Physics and Chemistry_, vol. ii., part vi., _Report on the Magnetical Results_ by Staff-Commander Creak, F.R.S.)
[224] PAGE 162, LINE 2. Page 162, line 3. _quarè & respectiuum punctum ... excogitauit._--The passage referred to is in _The newe Attractiue_ of Robert Norman (Lond., 1581), chap. vi.
"Your reason towards the earth carrieth some probabilitie, but I prove that there be no _Attractive_, or drawing propertie in neyther of these two partes, then is the _Attractive_ poynt lost, and falsly called the poynt _Attractive_, as shall be proved. But because there is a certayne point that the Needle alwayes respecteth or sheweth, being voide and without any _Attractive_ propertie: in my judgment this poynt ought rather to bee called the point Respective ... This Poynt _Respective_, is a certayne poynt, which the touched Needle doth alwayes _Respect_ or shew ..."