40 Dr. Berger on the Isle of Man, 



Dauby-point, and in the intervening space between Peel-town and 

 Kirk-michael. 



Cronk-dhoo is the highest place where I have observed the 

 grey-wacke. The shade indeed that seems to discriminate it from 

 the clay-slate is so delicate, that were I to speak decidedly it would 

 be rather unphilosophical. It has a grey colour inclining to a 

 greenish hue, the joints ferruginous ; it possesses a silky lustre 

 which it seems to derive from talc intimately blended or inter- 

 woven with the basis itself, but there are besides a good many 

 small specks of mica. 



At Banks-how the grey-wacke has a much more decided 

 character. It is rather thick slaty and of a granular texture, 

 traversed by veins of white quartz standing out in relief. The 

 basis has a greenish tinge approaching to grey, contains no spangles 

 of mica and comes near to quartz sandstone. \Vhen disintegrated 

 it forms but a meagre soil, fit for little else than oats. 



Large tabular masses distinguish the grey-wacke of Clay-head. 

 The fracture in the small is granular-scaly, the colour greenish 

 grey, passing to ferruginous on the natural joints, it does not fuse 

 unless where there are spangles of mica. 



Near Laxey there is a grey-wacke-slate used as flags for flooring 

 houses, it is scarcely fusible but for the mica there is in it, thin 

 coatings of an ash-grey colour over-run the surface. 



The following beds of grey-wacke-slate, alternating with each 

 other, appear on the south quay of Douglass, 



Tirst variety. Texture earthy, of a dirty grey colour, contains 

 spangles of mica, fuses into a whitish enamel. 



Second variety. Striated, of an hard and dry aspect, infusible, or 

 merely glazed from the mica that enters sparingly into its com- 

 position. The colour varies from greyish to olive-grey. 



