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 the 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 north, to Glenwhelt on the sonth ; 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 

 tie following gentlemen were elected office-bearers of the Society for the ensu- 

 ing year: — Dr. Scoules, M.D., E.L.S., President ; Thomas Struthers and John 

 Young, Esqrs., Vice-Presidents; James Home, Esq., Honorary Secretary; 

 Robert W. Skipsey, Esq., Treasurer. 



Council of Management. — Messrs. H. W. Crosskey, "Win. Johnston, J. C. 

 Douglas, Mark Eryar, E.G.S., James Stewart, Ed. Wimsch, Jas. Armstrong, 

 Win. 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 culture." By Rev. William 

 Erazer, of Paisley. 



Nov. 7. — " On the Volcanic Rocks of the Scottish Carboniferous Eorma- 

 tion, as illustrated by the extinct volcanos of Auvergne." By Archibald 

 Geikie, Esq,E.G.S. 



A course of Seven Lectures on Inorganic Geology. By John Scouler, Esq., 

 M.D., E.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.' 5 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. — " Metamorphic 

 Rocks." 



January 9, 1862. — " On Dislocations and other Disturbances in Coal and 

 Metal Mines." By Mark Eryar, Esq., E.G.S., Glasgow School of Mines. 



Jan. 16. — " On the Winning and Working of Coal." By Ralph Moore, 

 Esq., Mining 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. 



