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INDEX
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| Actinolite rock, mass of in gneiss, 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 |
