No. 660. 



Decade VI.— Vol. VI.— No. VI. Price 2s. 



Th< 



Geological Magazine 



fl>ontbl$ 3ournal of (Beolooy. 



CORPOEATED /^^SOU'^ 11 " S ^fy/^ 



WITH WHICH IS IN 



THE GEOLOGIS; 



EDITED BY 



JUN2 5 1 119 



HENRY WOODWARD, LL.D., F\^.4^. 



Onati M" c ' 



R. H. RASTALL, M.A., F.G.S. 



ASSISTED BY 



Peof. J. W. GREGORY, D.Sc, F.R.S. | Peof. W. W. WATTS, Sc.D., F.R.S. 



Peof. J. E. MARR, Sc.D., F.R.S. I HENRY WOODS, M.A., F.R.S. , F.G.S. 



Sir JETHRO J. H. TEALL, Sc.D., F.R.S. De. A. SMITH WOODWARD, F.R.S. 



JUNE, 1919. 



CONTENTS :— 



Page 

 Editorial Notes 241 



Original Articles. 



Foliation and Metamorphism . By 

 Professor T. G. Bonney. {Con- 

 cluded.) 246 



Non- German Sources of Potash. 

 By Dr. A. Holmes 251 



Notes on Yunnan Cystidea. Part III 

 (continued). By Dr. F. A. 

 Bather. (Plate VI.) 255 



Drake's Island, Plymouth. By 

 E. B. Bailey 262 



The Minerals of the Lower Green- 

 sand. By R. H. Rastall. {Con- 

 cluded.) 265 



A Scandinavian Erratic from the 

 Orkneys. By W. I. Saxton 

 and A. T. Hopwood 273 



Reviews. 



The Coral-reef Problem 274 



Subsidence of Coral Reefs 276 



The Antiquity of Parasitic Disease 276 



Previews {continued). Page 



Fossils from Queensland 277 



Revision of Phacopids 278 



Phylogeny of Acorn Barnacles 278 



A Century of Science in America... 279 



Ore-deposits in Montana 280 



Inclusions in Antartic Lavas 281 



Geology of Kongsberg, Norway . . . 281 



Glacier Lakes in Southern Norway 282 



Erosion in Portugal 282 



The Charters Towers Goldfield 283 



The Geology of Gatooma 283 



Enrichment of Copper Ores in 



Japan 284 



Ring Ore from Japan 284 



Pre-History in Essex 284 



Another Fossil Tzetze Fly . . 285 



Reports and Proceedings. 



Geological Society of London 285 



Palseontological Society 288 



Obituary. 



T. E. G. Bailey 288 



Fernand Priem - 288 



LONDON: DULAU & CO., Ltd., 34-36 Margaret Street, 

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