is
[Greek: miltos tektonike]. Est enim alia nativa, alia factitia. Natiua a
Germanis proprie dicitur berckrottel. haec apud nos est fossilis.... Porro
factitia est rubrica fabrilis, a Germanis braunrottel, quae fit ex ochra
usta, ut Theophrastus et Dioscorides testantur."

[73] PAGE 22, LINE 19. Page 22, line 20. _In Sussexia Angliae._--In
Camden's _Britannia_ (1580) we read concerning the iron industry in the
villages in Sussex: "They are full of iron mines in sundry places, where,
for the making and founding thereof, there be furnaces on every side; and a
huge deal of wood is yearly burnt. The heavy forge-hammers, worked by
water-power, stored in hammer-ponds, ceaselessly beating upon the iron,
fill the neighbourhood round about, day and night, with continual noise."

[74] PAGE 23, LINE 1. Page 22, line 44. _in libro Aristotelis de admirandis
narrationibus._--The reference is to the work usually known as the _De
Mirabilibus Auscultationibus_, Cap. XLVIII.: "Fertur autem peculiarissima
generatio esse ferri Chalybici Amisenique, ut quod ex sabulo quod a fluviis
defertur, ut perhibent certe, conflatur. Alii simpliciter lotum in fornace
excoqui, alii vero, quod ex lotura subsedit, frequentius lotum comburi
tradunt adjecto simul et pyrimacho dicto lapide, qui in ista regio plurimus
reperiri fertur." (Ed. Didot, vol. ii., p. 87.) According to Georgius
Agricola, the stone pyrimachus is simply iron pyrites.

[75] PAGE 23, LINE 22. Page 23, line 23. _vt in Italia Comi_, &c.--This is
mostly taken from Pliny. Compare the following passage from Philemon
Holland's translation (1601), p. 514:

"But the most varietie of yron commeth by the meanes of the water, wherein
the yron red-hot is eftsoones dipped and quenched for to be hardened. And
verely, water only which in some place is better, in other worse, is that
which hath ennobled many places for the excellent yron that commeth from
them, as namely, Bilbilis in Spaine, and Tarassio, Comus also in Italie;
for none of these places have any yron mines of their owne, and yet there
is no talke but of the yron and steele that commeth from thence."

Bilbilis is Bambola, and Tariassona the Tarazona of modern Spain.

[76] PAGE 24, LINE 28. Page 24, line 27. _Quare vani sunt illi
Chemici._--Gilbert had no faith in the alchemists. On pp. 19 and 21 he had
poked fun at them for declaring the metals to be constituted of sulphur and
quicksilver, and for pronouncing the fixed earth in iron to