he _Preface Magneticall_,
where he speaks of the "iron-workes" used in building ships. The
phraseology of Marke Ridley throws much light on the Latin terms used by
Gilbert.

[101] PAGE 38, LINE 36. Page 38, line 42. _vruntur;_ changed in ink to
_vrantur_ in the folio of 1600; but _uruntur_ appears in the editions of
1628 and 1633.

[102] PAGE 39, LINE 12. Page 39, line 12. _virumque;_ altered in ink to
_virunque_ in all copies of the folio edition of 1600.

[103] PAGE 40, LINE 32. Page 40, line 33. _ad tantos labores
exantlandos._--Pumping, as it was in mining before the invention of the
steam engine, may best be realized by examining the woodcuts in the _De re
metallica_ of Georgius Agricola (Basil., Froben, 1556).

[104] PAGE 40, LINE 34. Page 40, line 36. _quingentas orgyas._--Gilbert
probably had in his mind the works of the Rorerbuehel, in the district of
Kitzbuehl, which in the sixteenth century had reached the depth of 3,107
feet. See Humboldt's _Cosmos_ (Lond., 1860, vol. i., p. 149).

[105] PAGE 43, LINE 34. Page 43, line 33. _glis._--This word, here
translated _grit_, does not appear to be classical Latin; it may mean _ooze
or slime_.

[106] PAGE 45, LINE 25. Page 45, line 26. _Motus igitur ... quinque._ The
five kinds of magnetic motions correspond in fact to the remaining sections
of the book; as follows: _Coitio_, Book II.; _Directio_, Book III.;
_Variatio_, Book IV.; _Declinatio_, Book V.; and _Revolutio_, Book VI.

[107] PAGE 46, LINE 7. Page 46, line 8. _Jofrancus Offusius._--The
reference is to the treatise _De divina astrorum faculitate_ of Johannes
Franciscus Offusius (Paris, 1570).

[108] PAGE 47, LINE 15. Page 47, line 18. _Graeci vocant_ [Greek:
elektron], _quia ad se paleas trahit._ In this discussion of the names
given to amber, Gilbert apparently conceives [Greek: elektron] to be
derived from the verb [Greek: helkein]; which is manifestly a doubtful
etymology. There has been much discussion amongst philologists as to the
derivation of [Greek: elektron] or [Greek: elektron], and its possible
connection with the word [Greek: elektor]. This discussion has been
somewhat obscured by the circumstance that the Greek authors unquestionably
used [Greek: elektron] (and the Latins their word _electrum_) in two
different significations, some of them using these words to mean amber,
others to mean a shining {32} metal, apparently of having qualities between
those of gold and silver, and probably som