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 | ã | Guilielmo Gilberto Colcestrensi, | Medico Londinensi | ... Omnia nunc diligenter recognita & emen- | datius quam ante in lucem edita, aucta & figu- | ris illustrata operâ & studio | Wolfgangi LOCHMANS I.U.D. | & Mathemati: | Ad calcem libri adjunctus est Index Capi- | tum Rerum et Verborum locupletissimus | EXCVSVS SEDINI | Typis Gotzianis Sumptibus | _Ioh: Hallervordij._ | Anno MDC.XXVIII || _verso_ blank; (3) Præfatio; (4) Amicorum Acclamationes (verses) || _verso_ blank. _Sig._ A Ad Lectorem Candidum. _Sig._ A2 _verso_ Ad Gravissimum Doctissimum[=q] Virum. _Sig._ B2 Verborum quorundam interpretatio. _Verso_ blank, followed by twelve engraved plates numbered I. to XII. _Sig._ B3 is numbered as p. 1, and begins GVILIELMI GILBERTI | DE MAGNETE. | LIBER I. _Sig._ C _begins as p. 5_; _Sig._ D as p. 13; and so forth. The collation therefore is: 4 ll. unnumbered, ABCDEFGHIKLMNOPQRSTVXYZAaBbCcDdEeFfGgHhIiKkLlMm, _all fours. Pagination ends on_ p. 232, _which has Sig._ H_3 _in error for_ Hh_3, _being the end of the text. Verso of_ Hh_3 blank. Index capitum _begins fol._ [Hh_4] _and_ with Index Verborum _continues to verso of_ Mm_3. _Last leaf_ [Mm_4] _contains Errata, and instructions to binder to place plates: verso_ blank. _Quarto. Woodcut initials and diagrams. Without any colophon, printer's Mark, or date at end._ In some copies the engraved title differs, having the words _Ioh: Hallervordij._ replaced by the word _Authoris_.