760 Intelligence and Miscellaneous Articles. 



side of the granitic boss in the Orange Free State. It is shown 

 that along its margin the granite has removed, possibly by absorp- 

 tion, but more probably by ' underhand stoping,' varying amounts 

 of the sediments from point to point ; that it has reacted with the 

 basic intrusions in the sedimentary beds, with the consequent pro- 

 duction of hybrid rocks ; that, in one place, a subsidiary intrusion 

 of granite occurs in the middle of the diabase ; and, finally, that 

 the granite, where it comes into contact with the slate members 

 of the Witwatersrand Series, has induced a definite type of meta- 

 morphism in them, producing a magnetite-actinohte-stam'olite 

 rock, which is of an entirely distinct type from that induced by 

 the basic intrusion associated with the Witwatersrand Beds, a 

 micaceous phyllitic rock. It is suggested that the Yredefort 

 Granite, instead of being 'Archaean,' is of a post-Pretoria-pre- 

 Karroo age, if not contemporaneous with, at least connected with, 

 the same epoch of igneous activity as the ' Red Granite ' of the 

 Northern Transvaal. 



June 10th. — Dr. A. Smith Woodward, F.R.S., President, 

 in the Chair. 



The following communication was read : — 



' The Ballachulish Fold near the Head of Loch Creran (Argyll- 

 shire).' By Edward Battersby Bailey, B.A., F.G.S. 



The district of Lower Glen Creran lias recently been much more 

 carefully examined than heretofore. The course of the Ballachulish 

 Fold had alread}^ been determined with approximate accuracy. The 

 purpose of the present paper is to draw attention to two phenomena 

 strikingly illustrated by the local evidence : — 



(1) The complexity of the slides affecting the Ballachulish Core, 

 and the correlated (quite exceptional) occurrence of more groups 

 towards the close of the fold, south-east of the River Creran, than 

 towards the gape, north-west of the same. 



(2) The intense secondary refolding of the Ballachulish Fold, 

 and the resultant sinuous outcrop of the Ballachulish Core. 



LXXXII. Intelligence and Miscellaneous Articles. 



To the Editors of the Philosophiccd Magazine. 



Gentlemen, — 



I wish to indicate an error in the curves of figs. 4 and 5 in 

 "Notes on the Motion of Viscous Liquids in Channels," published 

 in the Philosophical Magazine for July last. 



To represent correctly the formulae, the gradients should be zero 

 at both ends of the curve of fig. 4 and at the left-hand end of the 

 curve of fig. 5. I am, 



Tours faithfully, 



The University, Liverpool, J. PUOTJDMAX. 



Oct. 8th, 1914. 



