

CONTENTS. 



• 146 



- 148 



- 157 



• 159 



XV 



l 



Felspathic Porphyries, &c. (not intrusive) 



Merionethshire 

 Snowdon series 



Intrusive Igneous rocks 



North Wales 



Montgomeryshire and Shropshire 

 Radnorshire (near Builth) • 

 St. David's, Pembrokeshire - 

 Intrusive Quartz porphyry (Llanberis) 

 tact with it 



Greenstone Dykes 



PAGB 



- 194 



- 196 



- 199 



- 205 



- 206 



- 208 



altered rocks in con- 



- 211 

 • 213 



160 



Wall-case 5. 



Serpentine Diallage, Steatite, &c, described by H. W. Bristow 



214 



he 



- 161 



- 162 



by 



164 



ns 

 m 172 



^ a 



178 



18? 

 18» 



I* 



Wall-cases 6 & 7. 



notes. Preliminary notice, by A. C. Ramsay - 



Constituents of Granite • 



Granite - 



Schorlaceous Granite - 



Schorl Rock • 



Schorl -•••■'"• 



Granite Veins and Dykes - 



Granitic and felspar Porphyries, &c, and Dykes 



Felspathic Porphyries, Elvans, &c. - 



Decomposed Granites - 



Felspathic Traps, &c 



Syenite and syenitic rocks - . . 



Greenstones • 



Hornblendic rocks - 

 Vesicular and other Greenstones 

 Volcanic rocks from Brent Tor, Devonshire 

 Toadstone, Amygdaloid, &c. 

 nadian and Australian specimens 



W. Bristow, with 



- 219 



- 221 



- 221 



- 227 



• 229 



- 230 



- 231 

 . 232 



- 238 



- 240 



• 240 



- 241 



- 243 



- 248 



- 249 



- 250 



- 251 



- 253 



