30 CATALOGUE OF PHILOSOPHICAL APPARATUS, &c. 



Drawer 14. Basalt and Trap Tuff. Arthur's Seat. 



This well-known rock is an intimate mixture of a zeolitic mineral and of magnetic iron ore, 

 both of which are soluble in Hydrochloric Acid ; and of Augite, which is insoluble in that 

 menstruum. Water is always present. 



Drawer 15. Various Trap rocks. Calton Hill, Edinburgh. 



Drawers 16 and 17. Suite of specimens from Salisbury Crags, Edinburgh. 



Shewing the sandstone near its contact with Trap, in various stages- 

 of alteration, and also in its unaltered condition. 



The localities from which the specimens in this and the four preceding drawers are taken, 

 were of old the scenes of many fierce contentions at Edinburgh, between the favourers of the 

 Neptunian and Huttonian theories ; some of these places, as Calton Hill, appearing to 

 favour the former, others, as Arthur's Seat and Salisbury crags, to support the latter hypo- 

 thesis. 



Drawers 18 and 19. Suite of rocks consisting of clinkstone*, clay porphyry, 

 and slates, from the Pentland Hills, Edinburgh. 



Drawer 20. Suite of specimens from near Stirling Castle. 



Illustrating the changes brought about in these rocks by the Basalt. 



See Macculloch, in the Geological Transactions, vol. III. p. 305. 

 Drawer 21. Trap rocks. Dumbartonshire and Fifeshire. 

 Drawer 22. Trap rocks from various parts of Scotland. 



ISLE OF ARRAN. 



Drawer 23. Pitchstones. Cory Gills. 

 Prawer 24. -Pitchstones. Lamlash Island, near Arran. 

 Drawers 25 and 26. Trap dykes of various kinds, including Pitchstone, Arran. 



Drawers 27 and 28. Clay porphyry and other rocks associated with it, 

 Lamlash Island, near Arran. 



For the geology of Arran, Jameson's Geological Travels, and Ramsay's later work may be 

 consulted. 



* A rock composed, according to Gmelin, of glassy Felspar and a Zeolitic mineral. 



