FREE BOOKS

Author's List




PREV.   NEXT  
|<   113   114   115   116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137  
138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   >>   >|  
e interior in a frowning wall of basalt, and bounded on the south, where it opens to the sea, by the Scuir More. The Scuir is a precipitous mountain, that rises from twelve to fifteen hundred feet direct over the beach. M'Culloch describes it as inaccessible, and states that it is only among the debris at its base that its heliotropes can be procured; but the distinguished mineralogist must have had considerably less skill in climbing rocks than in describing them, as, indeed, some of his descriptions, though generally very admirable, abundantly testify. I am inclined to infer from his book, after having passed over much of the ground which he describes, that he must have been a man of the type so well hit off by Burns in his portrait of Captain Grose,--round, rosy, short-legged, quick of eye but slow of foot, quite as indifferent a climber as Bailie Nicol Jarvie, and disposed at times, like the elderly gentleman drawn by Crabbe, to prefer the view at the hill-foot to the prospect from its summit. I found little difficulty in scaling the sides of Scuir More for a thousand feet upwards,--in one part by a route rarely attempted before,--and in ensconcing myself among the bloodstones. They occur in the amygdaloidal trap of which the upper part of the hill is mainly composed, in great numbers, and occasionally in bulky masses; but it is rare to find other than small specimens that would be recognized as of value by the lapidary. The inclosing rock must have been as thickly vesicular in its original state as the scoria of a glass-house; and all the vesicles, large and small, like the retorts and receivers of a laboratory, have been vessels in which some curious chemical process has been carried on. Many of them we find filled with a white semi-translucent or opaque chalcedony; many more with a pure green earth, which, where exposed to the bleaching influences of the weather, exhibits a fine verdigris hue, but which in the fresh fracture is generally of an olive green, or of a brownish or reddish color. I have never yet seen a rock in which this earth was so abundant as in the amygdaloid of Scuir More. For yards together in some places we see it projecting from the surface in round globules, that very much resemble green peas, and that occur as thickly in the inclosing mass as pebbles in an Old Red Sandstone conglomerate. The heliotrope has formed among it in centres, to which the chalcedony seems to have been drawn, as if by
PREV.   NEXT  
|<   113   114   115   116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137  
138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   >>   >|  



Top keywords:
chalcedony
 

inclosing

 

thickly

 
generally
 

describes

 

scoria

 

original

 

Sandstone

 

vesicular

 

laboratory


vessels

 
curious
 

chemical

 
receivers
 
vesicles
 

retorts

 

conglomerate

 

numbers

 

occasionally

 

composed


masses

 

recognized

 

lapidary

 

heliotrope

 

specimens

 
centres
 

formed

 

process

 

carried

 

amygdaloid


abundant

 

verdigris

 
exhibits
 

amygdaloidal

 

influences

 

weather

 

brownish

 

reddish

 

fracture

 

bleaching


resemble
 
globules
 

filled

 

translucent

 

surface

 
exposed
 

places

 
projecting
 
opaque
 

pebbles