Dr. M'^Culloch's Additional Remarks 07i Glen Tilt. Q^ 



place, between Fealair and the head of Glen Fernat. It is part of a bed 

 which, like many of those before described, alternates both with micaceous 

 schist and quartz rock ; the beds every where changing their characters, both 

 in their alternations and in their lateral progress. In some places it is of a 

 continuous and considerable thickness ; while in others the laminae do not 

 exceed an inch or two, and alternate with blueish-gray earthy limestone and 

 with micaceous schist. The texture is large-grained, and the fracture glisten- 

 ing; and its colour is a fine full-toned pink, wherever it does not pass into the 

 gray just described. If a correct taste had not long since condemned the 

 attempt to imitate colour as well as form in statuary, the tint of this marble 

 would have rendered it an admirable substance for the representation of the 

 naked figure. Nor does it appear applicable to mere architectural decoration ; 

 being of too insipid a character to stand alone, and ill adapted to harmonize 

 with the colours prevalent in this class of ornament. 



As this colour is of rare occurrence in limestones, I may point out another 

 bed of the same nature, which is found in the hills that bound the Tilt to the 

 southward. Like the other limestones already described, it alternates with 

 the quartz rock and other associated substances, reaching from the Fender 

 towards the house of Lude. It is of an extremely fine texture, minutely gra- 

 nular, yet highly crystalline, like the finest arenaceous specimens from Car- 

 rava, and is so hard that an ordinary knife scratches it with difficulty. Its 

 colour is neither so strong nor so continuous as that of the preceding, and 

 indeed often vanishes altogether ; but, wherever it exists, it borders more on 

 the dilute crimson than the former. It is exceedingly translucent on the 

 edges, and transmits a redder light than it reflects. 



Besides the white marble already described as occurring at Gow's Bridge, 

 another large bed exists in the hills that form the south-eastern boundary of the 

 valley. In geological position it lies at a great distance from the former, an 

 immense series of beds of quartz rock being interposed. It is found at the 

 foot of Cairn Lia, not far from the Queen's road, and in the lands of Ludet 

 It is of a large-grained texture, and, where it is purely white, cannot be distin- 

 guished from the Parian. As far however as it is hitherto accessible, there 

 is not much to be seen of so pure a quality ; the predominant portion being 

 tinged with a slight gray hue, such as would be produced by wetting a white 

 substance capable of absorbing water. Hence also it displays a sort of trans- 

 parent surface, which destroys its value in an oeconomical view. This gray 

 colour seems indeed in a good measure to depend on the presence of water in 

 the stone, as it is removed from many of the specimens by drying, when they 

 assume a tolerably pure white aspect with a considerable lustre. It is not 



