mid of a Mineralogical System j by the late Dr Walker. 89 
of that country, and of the stewartry of Kirkcudbright. Dur- 
ing that time, I transmitted to the Edinburgh Society a collec- 
tion of Maries, and other natural manures, for which I received 
a Silver Medal : and, for a second collection of the same sort, a 
Gold Medal was adjudged to me. 
It was this that first made me known to Dr Cullen. I atr 
tended hk course of chemistry two winters ; and, being favoured 
with his friendship and intimacy, I became more and more at- 
tached to mineralogy, which indeed was at that time his own fa- 
vourite pursuit. 
During the short while I lived at Glencross, I went one sea- 
son to the Goat-whey, in Breadalbane, along with Dr Cullen ; 
when our whole time was occupied with examining and collect- 
ing the minerals in that part of the Highlands. Another excur- 
sion I made into Fife ; when I examined that country, the shores 
of the Tay, and Kinnoul Hill. A third was made to Clack- 
mannanshire, when I visited the silver and cobalt mines at Alva, 
and the copper mine at Airthry, which were then worked. 
During my long residence at Moffat, I collected, in a number 
of short tours, all the remarkable minerals in Dumfries-shire, the 
Forest of Selkirk, Tiviotdale, Ayrshire, and Clydesdale. I vi- 
sited the lead-mines at Mackrymore, the copper mines at Co- 
vend, and the mines of antimony in Eskdale. Leadhills and 
Wanlock being within a forenoon’s ride, I frequently visited the 
mines at these places, and went down in them to the greatest 
depths. They are not only the richest and most extensive, but 
the most varied in their productions, of any in Scotland. Though 
I may have been at these mines about thirty times, I never paid 
one visit in which I did not find something new. Between the 
years 1761 and 1764, I found in those mines the Strontianite ; 
the Ore, and the Ochre of Nickel ; the Plumbum pellucidum of 
Linnaeus 5 the Plumbum decahedrum and cyaneum, both unde- 
scribed ; the Saxum metalliferum of .the Germans ; the Ponde- 
rosa aerata of Bergman ; and the Morettum, which afterwards 
appeared to be a peculiar sort of Zeolite. All these were here', 
for the first time, discovered in Britain ; besides the .green, grey, 
and yellow ores of lead, with other minerals which are r^re, and 
seldom met with in other places. 
