Dec. 1861 .]• q H Gmhgy of the -N'eilghevries & 2$S 



to each other, and to the transverse joints. The rock -ondts wea- 

 thered surfaces is of a white color, and the lamina} of Quartz are 

 more --distinctly seeu. - v ~- si?<P - 



4th, 5th, 6th. — Red, white, and green compact granites 1 , con- 

 taining garnets. These rocks are extensively difTused-mihe neigh- 

 bourhood of Dodabett. ^ - < sliT ■ 



Compact Felspar enters so largely into the rocks of these Hills^ 

 that I am actuated to subjoin a list of those thave met with con- 

 taining it. ' ' &Mdm m Mm&w- a|i 



1st. — White Syenite, being nearly all compact Felspar with a 

 few grains of Quartz, and Hornblende, disseminated : the edges 

 of this rock when fractured are sharp and highly translucent— it is 

 occasionally striated with Hornblende. 



2nd. — It passes into red syenite with the same ingredients, ~An 

 opinion has recently be6n started, that the Logan Stones comtnpi 

 in Britain, are not the works of the Druids, and ancient inhabi- 

 tants ; but the result of decomposition. I have now before me a 

 natural model in red Syenite, of one of those stones, which I found 

 near Snowdon. 



It contributes greatly to sustain the new theory relative tq the 

 origin of the Logan Stones, ., 



The. red syenite when decomposing J^as its surface ,, traversed Jby 

 cracks intersecting each other, rtoh^Mq 



3rd.-T-Brown syenite of. the sarAe .ingr^d^niSj $n4 4 s^mejimes 

 containing common Felspar. j 0 xuhum 



. ; 4th,-r-0reen. syenite,, .the, same in 



talline texture, both large grained and fine. Thii^ock* has been 

 improperly called green stone,, and green stone syenite, c the mis- 

 apprehension arising, fromats color> - It is^Qf^ je^^ommoa QCctB-r 

 pence. , . . ( . , . } . , , . ... . , gkb JiwmJalt 



.In some pieces I found at Kulhutty pnimViWay-ui) the' GhaJufy 

 X^nnanion.istpne,, ami ^ma.rag^te occpr^ garnets arer also., found 

 ; embeid4ed.w! ,,,-. } ...u . .. pmuhq mks\mx*& IptbsdmahM 



The rounded summits 1 of ifche tHills fe»^^^tt>oii*te)ldff 3 bteC^- 



