X VIII. Miscellaneous Remarks accompanying a Catalogue of Specimens 

 transmitted to the Geological Society, 



By J. Mac Cuixoch, M.D^ F.L.S. Chemist to the Ordnance, and Lecturer 

 --•'.'.on Chemistry at the Royal Military Academy at Woolwich. 



V. Pr. Geol. Soc. 



H 



_AVING had an opportunity during the Society's late recess of 

 collecting some specimens of the mineral productions and rocks of 

 Scotland, I have transmitted them with a hope that other members 

 who may have the means of so doing, will make still greater exer- 

 tions in aid of this very necessary department of our museum. 

 Such collections, hovv^ever useless in an insulated state, acquire a real 

 importance from their union, and form by their accumulation one of 

 the leading objects of such an institution, a point of reference for 

 authority whether geographical or mineralogical. 



To these specimens I have been induced to add the miscellaneous 

 remarks which form the present paper, with a view of attaching to 

 them more interest than would accrue from the mere mention of a 

 naked habitat^ and for the further purpose of rendering the catalogue 

 which must accompany them, more intelligible. These remarks 

 include such geological observations on the nature and connections 

 of the rocks from which the specimens were detached, as occurred 

 to me at the time, or were the result of comparison with the obser- 

 vations of other writers who have treated the same subjects. Where 

 the specimens themselves are deiicieiit in the requisite purposes of 



