[ 26 ] 
imparted to glafs by Bohemian granates, which he 
condantly pradlifed at a manufadtory in Flan- 
ders [a\. It is well known that it^on is the metal 
contained in thofe ftones ; that they obey the load- 
ftone [b ^ ; and that, being calcined with a proper 
heat, they yield a confiderable quantity of iron [c). 
I expofed in a crucible to a glafs-houfe fire, for the 
fpace of thirty hours, part of a flint glafs retort, 
in which a native green vitriol of iron had been 
diftilled, and which had been corroded and tinged 
by it: by this means it became coloured of a fine 
violent fire; when the matter was melted, I flung in an inflam- 
mable fubftancc: when that had intirely ceafed burning, I emptied 
the crucible, and obtained a mafs of a moji beautiful fapphirine 
blue ; but which, as one may imagine, fonn attracted the moifture 
of the air ; I repeated the experiment again without putting any 
black flux, and the colour became ftill finer; but it was remark- 
ably beautiful when the mixture was melted with a vitrifable 
earth. I can attribute this colour only to tlie parts of iron con- 
tained in the emery. 
[a] Neri, chap. 90. A curious perfon and pra£tical chemift 
may extra<Sf a wonderful red from gold, from filver a Jky colour, 
and a much fairer from granates of Bohemia, which are low 
priced ; for, being fmall, you may draw a tindture from them, as 
I have often done in Flanders. 
Boyle of gems, Shaw’s Abridg. vol. iii. p. 107. Sufpeefting, 
for feveral reafons, that {oyc\g. granates contain, befides other metal- 
line fubftances, many corpufcles of a ferruginous nature, I made 
choice of fome fmall ones, which, by their deep and almoft dark 
colour, I guefled to participate largely of and applied 
them to a vigorous loadllone, which, as I expedfed, took them 
up : and hereto they conftantly adhered till they were forcibly 
feparated therefrom — ibid. vol. iii. p. 120. A chalybeate tindlure 
obtained from granates. 
[f] Junker, tab. x. p. 273. Multi minus pell ucent ; 
atque ex his vulgares praeduri, atque alioquin igne indomiti, per 
ignem folarem grandibus vitris caufticis colledtum, denique in 
fluorem redadli funt, ac merum ferrum praebuere. 
tranfparent 
