[75]. Opuſc. chem. vol. II, p. 446.

[76]. Opuſc. Vol. II, page 309.

[77]. Some of the ſulphur and alum, ſublimed by the ſubterranean fires near Bilſton, contain ſiliceous earth. W.


TRANSCRIBER’S NOTES

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[50]of 2,155. 100 parts of contain about 25 ofof 2,155. 100 parts of it contain about 25 of