Vi CONTENTS OF VOLUME XXIX 
NUMBER IV 
DIFFUSION IN SILICATE Metts. N. L. Bowen . 
THE PHYSICAL CHEMISTRY OF THE CRYSTALLIZATION AND EEN Core 
DIFFERENTIATION OF IGNEOUS Rocks. J. H. L. Vogt , 
RuSSELL ForK Fautt oF SOUTHWEST VIRGINIA. Chester K. Went- 
worth : : : : Y : 
STUDIES OF THE Cucmm 4 OF Gunnar, William Herbert Hobbs 
REVIEWS 
NUMBER V 
DIASTROPHISM AND THE FORMATIVE Processes. XIV. GROUND- 
WorK FOR THE STUDY OF MEGADIASTROPHISM 
Part I. SumMMARY STATEMENT OF THE GROUNDWORK ALREADY 
Law. Thomas C. Chamberlin 
Part Il. THe INTIMATIONS OF SHELL DanerRNAnN. ‘Retin T. 
Chamberlin 
THE PHYSICAL CHEMISTRY OF THE Causmennmenaan AND enenne 
DIFFERENTIATION OF IGNEOUS Rocks. II. J.H.L. Vogt 
Types oF Rocky MouNTAIN STRUCTURE IN SOUTHEASTERN IDAHO. 
George Rogers Mansfield 5 
Discussion oF ‘‘SUMMARIES OF PRE-CAMBRIAN Teraarenanann OF INGE 
AMERICA” BY EDWARD STEIDTMANN. ‘Terence T. Quirke 
THE NATURE OF A SPECIES IN PALEONTOLOGY AND A NEW KIND OF 
TyprE SPECIMEN. Edward L. TROXELL 
REVIEWS 
NUMBER VI 
THEORETICAL CONSIDERATIONS OF THE GENESIS OF ORE DEPOSITS. 
R. H. Rastall 
Nore ON A PossIBLE FACTOR IN ‘Cansens OF ‘Ghonescen Chane. 
Harlow Shapley 
THE PLEISTOCENE SUCCESSION eee “Agena, Tana, AND THE aoe 
AGE OF THE MAMMALIAN Fossit Fauna. Morris M. Leighton 
THE PHYSICAL CHEMISTRY OF THE CRYSTALLIZATION AND MAGMATIC 
DIFFERENTIATION OF IGNEOUS Rocks. III. J. H. L. Vogt 
CYCLES OF EROSION IN THE PIEDMONT PROVINCE OF PENNSYLVANIA. 
F. Bascom 
THE HoRIzONTAL Mormons OF ‘(Gansencnmes AND THE RUNES 
NEAR THEIR SURFACE. H. A. Brouwer 
REVIEWS 
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