INDEX, 



Actinolite rock, mass of in gneiss, in the Island of Oransa 

 Adularia, found af Tintagel ..... 



Agate pebbles, found in Sky ...... 



found at Kinnoul, described 



, difficulty of describing the 



manner of their formation ..... 

 of the Giant's Causeway, the parallel plates lie 



in a horizontal position ..... 



decomposition of, in the gravel of Litchfield 



Aikin, Arthur, Esq. Notice of some peculiarities observed i; 



the gravel of Litchfield ..... 



— — , Notice on Shropshire witherite 



, on a green waxv substance found near 



Stockport ........ 



Alcyonia, (bund in the sandstone at Whorlbury Camp . 

 Allen, William, f.r.s. Barometrical Measurements, by 

 Alluvium, of Northumberland and Durham described 



, account of a remarkable deposit of, in Sky 



Alumine, its use when combined with lime for mortar 

 Aluminous Strata, at Campsie, Mr. Mackintosh, on the 

 Analcime, of a brick red colour, found in Sky 

 Anatase, on the primitive crystal of ... 

 Asbestus, found in Melmerby scar .... 



Avantwine, a variety of quartz rock .... 

 Augite, found in grains imbedded in the basalt of Teesttale 

 Augit rock, a rock of the trap family so called 



Baculites, found by Mr. Hony, near Maestricht 

 Barometrical Measurements, by Mr. Allen and Mr. Woods 

 Barytts, Sulphate of, Mr. Phillips on the primitive crystal of 



, on the cleavage of 



Basalt occurs in the lead mine measures of Northumberland 

 sometimes a regular bed in them 



1'AC.E 



18G 

 424 

 188 

 225 



226 



419 



428 



426 



438 



445 

 218 

 434 



95 

 189 

 433 

 445 

 188 

 250 



88 

 272 



74 

 182 



312 

 434 

 233 

 246 

 73 

 73 



