474 INDEX. 



PAGE 



Smith, Edward, Esq, on the Stream works of Pentowan . 4 04 



Snowdon, shells found in the slate of, . " . . . 425 



height of ....... 434 



Springs, in the neighbourhood of Bristol, their situation . 204 



St. Agnes, Rev. J. J. Conybeare, on the porphyritic veins of . 401 



Strath, in Sky, remarkable trap veins at ... 185 



Slrontian, found near Knaresborough ..... 445 



Sulphate of, found in balls in the sandstone near 



Bristol 196,202,214 



on the primitive crystal and cleavage of 255 



Staurotide, on the primitive crystal of 250 



Syenite, of Sky, described ....... 169 



Taylor, John, Esq. Description of the Tunnel of the Tavistock 



Canal, through Morwel Down in the county of Devon 146 



notice on some appearances in coak . 44S 



Tin, Oxide of, Mr. Philmps on the cleavage of 245 



Tino, Isle of, notice on the rocks of the .... 446 



Tintagel, shells found in the slate of ... 424 

 Traill, T. S. M,D. notice of iserine and magnetic iron-sand 



in Cheshire 447 



Trap, in the vicinity of Cruachan 137 



, of Sky described ....... 173 



, variety of, called augit rock by Dr. Mac Culloch described 182 



, variety of, called hypersthene rock by Dr. Mac Culloch 



described 184 



, account of remarkable veins of, at Strath in Sky . 185 



, Kinnoul Hill composed chiefly of 



, its varieties there, described 



— — , occurs at Micklewood in Gloucestershire 



of Kinnoul, both porphyritic and amygdaloidal 



, its junction with schist 



221 



222 

 444 

 223 

 228 

 180 



of Sky, additions to the account of 



— of Trotiernish, has the appearance of interstratification 



and alternation with the strata it covers . . . 180 



