PROCEEDINGS OF GEOLOGICAL SOCIETIES. 
507 
basaltic whin sill at the Crag is divided into two distinct beds, between which 
are strata of limestone and shale. The great basaltic crag, on which the 
tower stands, is seventy or eighty feet in thickness, and slopes to the south- 
eastward ; but towards the south end of the section it dwindles down to a few 
feet thick, proving that it is not a regular continuous stratum, but a wedge- 
shaped mass intruded among the mountain limestone beds ; and, in accordance 
with this, the heated igneous basalt has changed tlie shale below into porce- 
laine jasper, and the limestone above into crystalline marble. From the top of 
the crag Mr. Tate pointed out the range of this basalt through the county, 
from Kyloe on the nortli, to Glenwhelt on the south ; and especially showed 
that its relative position among the limestone strata is not the same throughout 
its range ; in one part a well recognized limestone sill is immediately above it, 
and in others many fathoms below it. 
Glasgow Geological Society. 
The annual general meeting of this Society took place on October 3rd, when 
♦he following gentlemen were elected office-bearers of the Society for the ensu- 
ing year: — Dr. Scoules, M.D., F.L.S., President ; Thomas Struthers and John 
Young, Esqrs., Vice-Presidents; James Horne, Esq., Honorary Secretary; 
Robert "W. Skipsey, Esq., Treasurer. 
Council of Management. — Messrs. H. W. Crosskey, Wm. Johnston, J. C. 
Douglas, Mark Eryar, E.G.S., James Stewart, Ed. Wimsch, Jas. Armstrong, 
Wm. Carey, James Thompson, Walter Graham, Andrew Armour, James Easton. 
The following lectures are to be delivered during the winter session : — 
October 31. — "On the advantages of Geological Studies, as recreative — 
as a mental discipline, and as promoting aesthetic cultui'c." By Rev. William 
Frazer, of Paisley. 
Nov. 7. — " On the Volcanic Rocks of the Scottish Carboniferous Forma- 
tion, as illustrated by the extinct volcanos of Auvergue." By Archibald 
Geikie, Esq., F.G.S. 
A course of Seven Lectures on Inorganic Geology. By John Scouler, Esq., 
M.D., F.L.S,, President. 
Nov. 14. — General view of Geological Science — causes at present in action — 
changes of climaate. Nov. 21 . — " Decay of Rocks from Chemical and 
Mechanical Causes, and consolidation of Strata." Nov. 28. — "Renovating 
causes — Volcanic Action." Dec. 6. — " Influence of the Organic Kingdoms 
in the formation of Strata." Dec. 13. — " Stratified Rocks and their Classifi- 
cation." Dec. 20. — " Igneous or Eruptive Rocks." Dec. 27. — "Metaraorphic 
Rocks." 
January 9, 1862. — " On Dislocations and other Disturbances in Coal and 
Metal Mines." By Mark Fryar, Esq., F.G.S., Glasgow School of Mines. 
Jan. 16. — " On the Winnmg and Working of Coal." By Ralph Moore, 
Esq., Mioing Engineer, Glasgow. 
Jan. 23. — " On Chemical Analysis as an aid to Geological Inquiry." By 
Dr. Wallace, Mechanics' Institution. 
Besides the above course, there will be the usual series of papers and dis 
cussions. 
