CONTENTS OF VOLUME XXIV vii 

 NUMBER VI 



PAGE 



The Pre- Wisconsin Drift of North Dakota. A. G. Leonard . 521 

 Evolution of the Basal Plates in Monocyclic Crinoidea camerata. 



II. Herrick E. Wilson 533 



Differentiation in Intercrustal Magma Basins. Alfred Harker 554 

 Stratigraphy of the Skykomish Basin, Washington. Warren S. 



Smith 559 



"Puff" Cones on Mount Usu. Y. Oinouye ...... 583 



Origin of Foliation in the Pre-Cambriam Rocks of Northern 



New York. William J. Miller 587 



The Composition of the Average Igneous Rock. Adolph Knopf . 620 



Reviews 623 



NUMBER VII 



The Genesis of Lake Agassiz: A Confirmation. W. A. Johnston 625 

 The Lower Embar of Wyoming and Its Fauna. E. B. Branson . 639 

 Evolution of the Basal Plates in Monocyclic Crinoidea camerata. 



III. Herrick E. Wilson 665 



Discovery of the Great Lake Trout, Cristivomer namaycush, in 



the Pleistocene of Wisconsin. L. Hussakof 685 



Assumptions Involved in the Doctrine of Isostatic Compensation, 



with a Note on Hecker's Determination of Gravity at Sea. 



William Herbert Hobbs 690 



A Stage Attachment for the Metallographic Microscope. Albert 



D. Brokaw 718 



Reviews . 720 



NUMBER VIII 



The Role of Inorganic Agencies in the Deposition of Calcium 



Carbonate. John Johnston and E. D. Williamson. . . . 729 



Notes on the Structural Relations between Australasia, New 



Guinea, and New Zealand. E. C. Andrews . . . . . 751 



A Botanical Criterion of the Antiquity of the Angiosperms. 



Edmund W. Sinnott 777 



Are the "Batholiths" of the Haliburton-Bancroft Area, On- 

 tario, Correctly Named ? W. G. Foye 783 



A Contribution to the Oolite Problem. Francis M. Van Tuyl . 792 



