ic system was attributed to the firmament, in order to account for
{51} several changes and motions observed in the axis of the world, and for
which they could not account on any other principle." (Barlow's
_Mathematical Dictionary_.)

[198] PAGE 118, LINE 10. Page 118, line 8. _cuspis is aut lilium._--Gilbert
uses _cuspis_ or _lilium_ always of the North-pointing end of the needle.
Sir Thomas Browne speaks of "the lilly or northern point"; but he differs
from Gilbert in saying "the _cuspis_ or Southern point" (_Pseudodoxia
Epidemica_, 1650, p. 46). Only in one place (p. 101, line 5) does Gilbert
speak of _cuspis meridionalis_. Everywhere else the south-pointing end is
called the _crux_.

[199] PAGE 118, LINE 15. Page 118, line 13. _nam aeque potens est._--Later
observation showed this view to be incorrect. The horizontal component of
the earth's magnetic field is not equally strong all over the globe, and
the sluggishness of the needle's return to its position of rest is not due
to the supporting pin becoming blunt with wear. The value of the horizontal
component is zero at the north magnetic pole, and increases toward the
magnetic equator. It is greatest near Singapore and in Borneo, being there
more than twice as great as it is at London. (See Captain Creak in _Report
of Voyage of H.M.S. Challenger, Physics and Chemistry_, vol. ii., part vi.,
1889.)

[200] PAGE 119, LINE 5. Page 119, line 2. _lapis._--Both Stettin editions
read _lapidis._

[201] PAGE 119, LINES 9-11. Page 119, lines 7-9. The gist of the whole book
is summarized in these lines. They furnish a cardinal example of that
inductive reasoning which was practist by Gilbert, and of which Bacon
subsequently posed as the apostle. Compare pages 41 and 211.

[202] PAGE 120, LINE 8. Page 120, line 5. _dicturi sumus_.--Change of
verticity is treated of in book iii., chap. x., pp. 137 to 140.

[203] PAGE 125, LINE 24. Page 125, line 29. _appositam._--All editions give
this word, though the sense requires _appositum._

[204] PAGE 128, LINE 9. Page 128, line 11. _non nimis longum._--The
editions of 1628 and 1633 read (wrongly) _minus_ instead of _nimis_.

[205] PAGE 130, LINE 12. Page 130, line 14. The word _hunc_ in the folio of
1600 is corrected in ink to _tunc_, and the Stettin editions both read
_tunc_.

[206] PAGE 132, LINE 9. Page 132, line 10. _minimus & nullius
ponderis._--The editions of 1628 and 1633 both wrongly read _est_ for _&_.

[207] PAGE 13