Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/469

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INDEX

	page
Actinolite rock, mass of in gneis, in the Island of Oransa	186
Adularia, found at Tintagel	424
Agate pebbles, found in Sky	188
———————— found at Kinnoul, described	225
————————————————, difficulty of describing the manner of their formation	226
———————— of the Giant's Causeway, the parallel plates lie in a horizontal position	419
———————— decomposition of, in the gravel of Litchfield	428
Aikin, Arthur, Esq. Notice of some peculiarities observed in the gravel of Litchfield	426
————————, Notice on Shropshire witherite	488
————————, on a green waxy substance found near Stockport	445
Alcyonia, found in the sandstone at Whorlbury Camp	218
Allen, William, F.R.S. Barometrical Measurements, by	434
Alluvium, of Northumberland and Durham described	95
————, account of a remarkable deposit of in Sky	189
Alumine, its use when combined with lime for mortar	433
Aluminous Strata, at Campsie, Mr. Mackintosh, on the	445
Analcime, of a brick red colour, found in Sky	188
Anatase, on the primitive crystal of	250
Asbestus, found in Melmerby scar	88
Avanturine, a variety of quartz rock	272
Augite, found in grains imbedded in the basalt of Teesdale	74
Augit rock, a rock of the trap family so called	182
Baculites, found by Mr. Hony, near Maestricht	312
Barometrical Measurements, by Mr. Allen and Mr. Woods	434
Barytes, Sulphate of, Mr. Phillips on the primitive crystal of	233
————, on the cleavage of	246
Basalt occurs in the lead mine measures of Northumberland	73
———— sometimes a regular bed in them	73