278 Dr. Fit TON ou the Geology of the 



in the County of Wicklow ; and I have observed it at Baltinglats 

 hill, within a few miles of that place. I may mention here, that 

 from the appearances of many specimens^ found in the neigh- 

 bourhood of Killiney, Mr. Stephens was inclined to suppose 

 that a connection existed between this singular species and 

 Andahis'iic. 



% Pitchstoue. This substance is found in a vein traversing 

 granite, in the vicinity of Newry in the County of Down. I am 

 indebted to Mr. Jameson of Edinburgh, for much of the following 

 description of its external characters, as it appears there. 



Its colour is intermediate between mountain and leek green. It 

 is massive. Fracture small and not very perfect conchoidal. 



Internal lustre, resino-vitreous and shining. It exhibits lamellar 

 distinct concretions ; the plates are from one-fourth to one-tenth of 

 an inch in thickness, and are further divisible into pieces of the 

 rhomboidal form of various angles. 



The surface of the concretions is smooth, and strongly glistening. 

 Slightly translucent on the edges. It scratches window-glass, but is 

 easily scratched by quartz. Easily broken. Specific gravity, 2,29. 

 Before the blowpipe without addition it yields a greyish-white 

 frothy enamel. 



It is in some places porphyritic, containing imbedded, minute 

 crystals of feldspar and of quartz. 



A letter from a very intelligent observer, who has examined this 

 substance in its native place, slates the following particulars respect- 

 ing its position. 



" The vein is first observable in the Townland of Newry, at the 

 *' bottom of a bank of granite, about half a mile from the northern 

 " end of the town, on the right of the road leading to Down- 

 *' Patrick. It crosses the road, and runs due westward, ending on 



