magnitude of earth prevents variation of, 163, 164.
none acquired by iron rubbed on aequator of terrella, 148.
not affected by position of loadstone, 144.
of one loadstone as affected by another, 69, 138.
opposite, acquired by iron touched by loadstone, 115, 125, 129.
parts having same repel, 122, 133.
pole of, where last contact is, 149.
strengthened in versoria, 147-150.
strength of, decreases at once in both poles, 146.
Villa nova, Arnaldus de, 2, 7.
vincentina, the, 48.
Vincent's Rock, gem of, 54.

Weather affects electricks, 48, 53, 55, 56.
weighing the magnetick force, 108.
Wright, Edward, his prefatory address, *iij _bis_, 7.
wrought iron is magnetick, 29, 139.

Youth preserved by loadstone, 32.

Zeilam, the king of, 32.
Zimiri, 11.
Zoroaster, 209.

{247} THIS TREATISE BY WILLIAM GILBERT, OF COLCHESTER, PHYSICIAN OF LONDON,
ON THE MAGNET, WAS FIRST PUBLISHT IN THE LATIN TONGUE IN LONDON IN THE YEAR
OF OUR LORD M.D.C.; THIS ENGLISH TRANSLATION, WHICH WAS COMPLETED IN THE
YEAR M.C.M., IS PRINTED FOR THE GILBERT CLUB, TO THE NUMBER OF TWO HUNDRED
AND FIFTY COPIES, BY CHARLES WHITTINGHAM AND COMPANY, AT THE CHISWICK
PRESS, TOOKS COURT, CHANCERY LANE, LONDON.

[Illustration]

* * * * *

NOTES

ON THE

DE MAGNETE

OF

DR. WILLIAM GILBERT

[Illustration]

PRIVATELY PRINTED

LONDON MCMI

"For out of olde feldes, as men seith,
Cometh al this newe corn fro yeer to yere;
And out of olde bokes, in good feith,
Cometh al this newe science that men lere."
--_Chaucer._

"I finde that you have vsed in this your tr[=a]slation greate art,
knowledge, and discretion. For walking as it were in golden fetters (as
al Translators doe) you notwithstanding so warilie follow your Auctor,
that where he trippeth you hold him vp, and where he goeth out of the
way, you better direct his foote. You haue not only with the Bee sucked
out the best iuyce from so sweete a flower, but with the Silke-worme as
it were wouen out of your owne bowels, the finest silke; & that which
is more, not rude & raw silke, but finely died with the fresh colour of
your owne Art, Invention, and Practise. If these Adamantes draw you not
to effect this which you haue so happilie begunne: then let these
spurres driue you forward: viz. Your owne promise, the expectation of