CONTENTS OF VOLUME XVIII 



VII 



PAGE 



On the Glacial Origin of Huronian Rocks of Nipissing, Ontario. 



Reginald E. Hore ......... 459 



Editorial ........... 468 



Reviews . ". 47° 



Petrological Abstracts and Reviews ..... 476 



Recent Publications ......... 484 



NUMBER VI 



An Experimental Investigation into the Action of Differen- 

 tial Pressure on Certain Minerals and Rocks, Employing 



the Process Suggested by Professor Kick. Frank D. Adams 489 



DissoROPHUS Cope. S. W. Williston 526 



A Mounted Skeleton of Platecarpus. S. W. Williston . . 537 



Older Drifts in the St. Croix Region. RoUin T. Chamberlin . 542 



"Rock Glaciers" or Chrystocrenes. J.B.Tyrrell . . . 549 



On a Peculiar Cleavage Structure Resembling Stretched 



Pebbles, near Ellijay, Georgia. W. C. Phalen . . -554 



Reviews 565 



Petrological Abstracts and Reviews . . . . 573 



NUMBER VII 



New Permian Reptiles: Rachitomous Vertebrae. S. W. Willis- 

 ton ........... 



The Physiography of the Bishop Conglomerate, Southwestern 

 Wyoming. John Lyon Rich . . . . . . • 



Contribution to the Petrography of the Keweenawan. Frank 

 F. Grout 



Diabase and Granophyre of the Gowganda Lake District, Onta- 

 rio. Norman L. Bowen .....••• 



Editorial 



Reviews 



Recent Publications . . . . ... 



585 

 601 



633 



658 



67s 

 676 

 678 



