13 ([return])
[ I must take this opportunity of acknowledging the great kindness with which this illustrious naturalist has examined many of my specimens. I have sent (June, 1845) a full account of the falling of this dust to the Geological Society.]
14 ([return])
[ So named according to Patrick Symes's nomenclature.]
15 ([return])
[ See Encyclop. of Anat. and Physiol., article Cephalopoda]
16 ([return])
[ Mr. Horner and Sir David Brewster have described (Philosophical Transactions, 1836, p. 65) a singular "artificial substance resembling shell." It is deposited in fine, transparent, highly polished, brown-coloured laminae, possessing peculiar optical properties, on the inside of a vessel, in which cloth, first prepared with glue and then with lime, is made to revolve rapidly in water. It is much softer, more transparent, and contains more animal matter, than the natural incrustation at Ascension; but we here again see the strong tendency which carbonate of lime and animal matter evince to form a solid substance allied to shell.]
17 ([return])
[ Pers. Narr., vol. v., pt. 1., p. 18.]