^{page 444 note *} Poggendorff's Annalen, i. 387.

^{page 444 note †} Ann. des Min. V. 393.

^{page 444 note ‡} Schweigger's Jahrbuch, ii. 69.

^{page 445 note *} Afhandlingar, ii. 154.

^{page 445 note ‡} Schweigger's Jahrbuch, v. 29.

^{page 446 note *} Afhand. iii. 304.

^{page 446 note †} Schweigger's Journ. xxi. 49.

^{page 446 note ‡} Afhand. iv. 317.

^{page 447 note *} Ann. de Chim. et de Phys. xxxvi. 22.

^{page 448 note *} Vol. ii. p. 262.

^{page 448 note †} Vol. iii. p. 174.

^{page 456 note *} Berzelius; Afhadl. vi. 190. The specimen was from Jutland.

^{page 456 note †} Arfwedson; Kong. Vet. Acad. Handl. 1824, p. 856. From Faroe.

^{page 456 note ‡} Berzelius; Ibid. The variety called Leveyne, and from Faroe.

^{page 457 note *} Since this paper was read to the Society, I have analyzed a flesh-coloured chabasite from the north of Ireland, and found it composed of

This approaches Berzelius' specimen, and shews us, that the lime in chabasite may be replaced by soda. The formula is,

^{page 458 note *} Philip's Mineralogy, p. 211.

^{page 460 note *} The name Wollastonite was given by Hauy to table-spar, or bisilicate of lime; but mineralogists in general have refused to adopt this appellation. I have been induced, therefore, in order to commemorate the many obligations which mineralogy owes to Dr Wollaston, to apply the term Wollastonite to a mineral which I believe to be new, and which has a very close relation to the species which Hauy designated by that name.

It occurs in veins in a greenstone which is situated near Kilsyth, on the banks of the Forth and Clyde Canal, and possesses the following characters:

Its colour is white, with a slight shade of green. Its texture is fibrous, and the fibres are in tufts diverging from a centre, thus exhibiting marks of an imperfect crystallization. The mineral is translucent on the edges, and has a lustre inclining to silky. The fracture is splintery, and the fragments are sharp-edged.

The hardness is intermediate between that of selenite and calcareous spar. Its specific gravity is 2.8760.

Before the blowpipe it melts with some difficulty into a white enamel. This fusion is not accompanied by any froathing. With borax it fuses into a bead-yellow, while hot, but becoming colourless on cooling. With biphosphate of soda in considerable excess, it fuses into a colourless bead, leaving a silica skeleton. With carbonate of soda it effervesces, and fuses into an opaque bead, with a reddish-blue colour.

The constituents of this mineral I found to be,

If we suppose the magnesia to have replaced a little lime, this mineral is a compound of

Thence its symbol is 4CS² + NS³, and it differs from table-spar, by containing 1 atom of tersilicate of soda united to 4 atoms bisilicate of lime; whereas tablespar is pure bisilicate of lime.

^{page 461 note *} Tom. xxx. p. 109.

^{page 462 note *} It was very ferruginous silica.

^{page 468 note *} See Silliman's Journal, iv. 19.

^{page 477 note *} Untersuchunger, p. 426.