Contents or Votume X XIX 
NUMBER I 
THE MECHANICAL INTERPRETATION OF JOINTS. II. Walter H. Bucher 
FEATURES OF A Bopy OF ANORTHOSITE-GABBRO IN NORTHERN NEW 
York. William J. Miller 
A New Foro oF Diplocaulus. M. G. Mehl 
A GLACIAL GRAVEL SEAM IN LIMESTONE AT RIPON, Weconen F. T. 
Thwaites 
STRAND MARKINGS IN THE Peering Senmmenonna OF Canes 
County, OKLAHOMA. Sidney Powers 
SUMMARIES OF PRE-CAMBRIAN LITERATURE OF ora et 
Edward Steidtmann 
EpiIToRIAL NOTE 
REVIEWS .. 
NUMBER II 
VOLCANIC EARTHQUAKES. Charles Davison 
THE STRATIGRAPHIC AND FAUNAL RELATIONSHIPS OF THE Weenies 
Group, MippLE EOCENE OF CALIFORNIA. Bruce L. Clark 
VULCANISM AND MountarIn-MAxkinc: A SUPPLEMENTARY NOTE. 
Rollin T. Chamberlin 5 
SUMMARIES OF PRE-CAMBRIAN Eeeearene OF NOE Awirnan. 
Edward Steidtmann 
REVIEWS 
NUMBER III 
THE MINERALOGRAPHY OF THE FELDSPARS. Part I. Harold L. Alling 
INTRODUCTION . 
FELDSPAR COMPONENTS . 
Two-CoMPONENT SYSTEMS 
‘THREE-COMPONENT SYSTEMS 
EXAMINATION OF CHEMICAL Anmees OF ipenpenes 
Microscopic EXAMINATION OF NATURAL FELDSPARS 
APPLICATION OF THE MINERALOGRAPHY OF THE FELDSPARS TO 
GEOLOGICAL PROBLEMS . 
APPENDIX . 
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