314, Mr. Knox's experiments and observations 
However, Dr. Fitton seems to have overlooked two 
very striking characters of it, which engaged my particular 
attention, and gave birth to those conjectures, which princi- 
pally induced me to undertake the analysis by which they 
have been verified. I mean the smell, and strong oily 
taste. 
“ This substance (Dr. Fitton observes), is found in a 
“ vein traversing granite, in the vicinity of Newry, in the 
“ County Down. Its colour is intermediate between moun- 
“ tain and leek-green. It is massive. Fracture small, and 
“ not very perfect oonchoidal. 
“ 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 blow- 
“ pipe, without addition, it yields a greyish-white frothy 
“ enamel. It is in some places porphyritic, containing im- 
“ bedded minute crystals of felspar and of quartz. 
“ A letter from a very intelligent observer, who has ex- 
“ amined this substance in its native place, states the follow- 
“ ing particulars respecting 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 lead- 
“ ing to Downpatrick. It crosses the road, and runs due 
“ westward, ending on the side of the great road from Newry 
