2S Mineralogkal Observations [July, 



experiment. The inflammation, however, was gone, and did not 

 again return. 



Nor was this quantity of heat, considerable as it was, the whole 

 that was evolved. Some was lost by the evaporation of the 

 moisture from the wet cloth, which must have taken place to a 

 certain extent, and some must have made its escape during the 

 night, when the wet clothes were applied very irregularly, and at 

 long intervals. 



e»to ,1 Mia bin 



Article VIII. 



Mineralogkal Observation wade in the Highlands of Scotland. 

 By James Grierson, M.D. 



On the 14th of August, 1812, Mr. Jardine, civil engineer, 

 and myself, left Edinburgh on a round by Loch Catherine and 

 Loch Tay, principally with the view of observing the geognostic 

 appearances of the country. 



On reaching the bridge of Doune, eight miles from Stirling, 

 we found the old red sandstone, forming nearly horizontal strata 

 in the bottom of the river. Soon after this we observed on the 

 road from Doune to Callander many rolled pieces of very 

 distinct gpejl wacke, which led me to suspect the approach of a 

 grey wacke country. From Callander we set out to visit the 

 famed and interesting scenery of the pass of Leney, by which 

 the traveller on this route enters the Grampian range. About 

 two miles beyond Callander we found the rock through which 

 the road is cut to be very distinct grey wacke, and traced it till 

 we found it about half a mile farther on towards the north-west, 

 very near the mica slate ; but could not see the junction of these 

 two rocks, or whether the clay slate intervened betwixt them. 

 On this road, about a mile and a half from Callander (to the 

 N.W. of it), we observed a greenstone vein, 12 or 15 feet 

 broad, intersecting the conglomerate in a direction nearly N.E. 

 and S.W. : it crosses the high road. A little below this, 

 towards Callander, transition slate appears in pretty highly 

 inclined strata, and the conglomerate resting upon it, and, we 

 thought, alternately with it. Neither of us could observe any 

 instance of the conglomerate coming in contact with the clay 

 slate; aRd we were both perfectly satisfied that in this district 

 the transition rocks, grey wacke, and grey wacke slate, come in 

 between the rloetz and the primitive country. 



It was my intention to have examined particularly the species 

 of minerals constituting the nodules of the conglomerate about 



