Note 27 — Chapter III
Reading edition
American Journal of Science for January 1845.
[28] Pseudo-morphic crystals are crystals moulded in the cavities left by other crystals which they have replaced. See Dr. Blum on Pseudo-morphous minerals.
[29] Bergman first determined the solubility of silex in simple water, aided by heat, and demonstrated its existence in the Geysers and other boiling springs of Iceland.—Parkinson, Org. Rem. vol. i. p. 324.
[30] See my "Notes on a Microscopical Examination of Chalk and Flint," Annals of Natural History, August 1845.