



•:»: 





'' 



[ K 





dm 

 i 1 



ff» 



4 









, .-■ 



i* 





. 















< 



■ 





t 



CORNWALL. 



221 



arc strictly volcanic products, of the date of the Carbonifer- 



Cases 



and Z 



loids. 



Nos. 236 to 2oo are chiefly vesicular traps and amyqda- 

 4 In some the vesicles are empty, in others they a e 

 filled with calcareous spar, quartz, or other bodies, generaUy 



) 



The remainder of the specimens on the lower shelf of 

 his case are chiefly Canadian. The upper shelf contains a 

 few specimens, mostly duplicates, and generally too lar" to 

 go in their proper places below. ° 



I, 



Wall-cases 6 and 7. 



Arranged and described by H. W. Bjhstow. 



•Hexagonal crystals 



of translucent 



(rock 



Quarnes, Caernarvonshire. Presented by Dr. Percy F B 8 



Felspar («7«wfc „/ a&mma «„rf potash) a la™ 

 JaWar crystal on granite.-Huel Damsc., Lenn^ Corn! 



4. 



+„„ • /«««"■«* //<«tes, xorming a dyke 12 feet widp 



traversing jrranite m <+ tw,v .~ - ' 



Cornwall P . !, r P 1S U ° nS01S > near St ' A «stle, 



Cornwall. Presented by R. Hunt, F.R.S. 



•ml * Specimens are Placed here to show the appear- 



an of t felspai% ftnd micaj the ^^ PPeai- 



Weal gramte is composed. 



Large grained granite, a ternary compound, made 



arge crystals of whit* A7~.~_ * 7 / ' uo 



felspar, translucent quartz [f? 



rare — Lundy Island. 



6. 



d) 



f felspar (white 



Upper 

 Gailekt. 



Wall-case 

 6 and 7. 



