your friends, the losse of some credit if you should steppe backe, the
profit which your labours may yeeld to many, the earnest desire which
you yourselfe haue to reviue this Arte, and the vndoubted acceptation
of your paines, if you performe the same."--(Prefatory epistle of John
Case, D. of Physicke, printed in R. Haydocke's translation of _The
Artes of Curious Painting_, of Lomatius, Oxford, 1598.)

"This booke is not for every rude and unconnynge man to see, but for
clerkys and very gentylmen that understand gentylness and
scyence."--_Caxton._

CHISWICK PRESS: CHARLES WHITTINGHAM AND CO.
TOOKS COURT, CHANCERY LANE, LONDON.

* * * * *

{ij}

[Illustration]

BIBLIOGRAPHY OF _DE MAGNETE_.

I. (THE LONDON FOLIO OF 1600.) _Fol. *j. title_ GVILIELMI GIL | berti
colcestren | sis, medici londi- | nensis, | DE MAGNETE, MAGNETI- | cisqve
corporibvs, et de mag- | no magnete tellure; Physiologia noua, | plurimis &
argumentis, & expe- | rimentis demonstrata. | _Printer's Mark_ | Londini |
excudebat Petrvs Short anno | MDC. || _*j verso_ Gilbert's coat of arms. ||
_*ij_ Ad Lectorem || _*iij verso_ Ad gravissimvm doctissimvmqve ... ||
_*vj_ Verborum quorundam interpretatio. || _*vj verso_ Index capitum. || p.
1. GVILIELMI GILBERTI | DE MAGNETE, LIB. I. || p. 240. FINIS. | Errata.
Without any colophon, printer's Mark, or date at end. _Folio. 8 ll. of
preliminary matter._ ABCDEFGHIKLMNOPQRSTV, _all ternions, making 120
numbered leaves. One blank leaf at front and one at end. Page 114 at end of
Liber II. blank. A folded woodcut plate inserted between p. 200 and p. 201.
Woodcut initials, headlines and diagrams. All known copies except one have
ink corrections in several pages, particularly pp. 11, 22, 47._

II. (THE STETTIN QUARTO OF 1628.) _Four preliminary unnumbered leaves,
viz._ (1) _Bastard title_ GULIELMI GILBERTI | Tractatus | DE MAGNETE ||
_verso_ blank; (2) _Engraved title._ TRACTATVS | Siue | PHYSIOLOGIA NOVA |
DE MAGNETE, | MAGNETICISQVE CORPO- | RIBVS ET MAGNO MAGNETE | tellure Sex
libris comprehensus | a | Guilielmo Gilberto Colcestrensi, | Medico
Londinensi | ... Omnia nunc diligenter recognita & emen- | datius quam ante
in lucem edita, aucta & figu- | ris illustrata opera & studio | Wolfgangi
LOCHMANS I.U.D. | & Mathemati: | Ad calcem libri adjunctus est Index Capi-
| tum Rerum et Verborum locupletissimus | EXCVSVS SEDINI | Typis Gotzianis
Sumptib