Vlll CONTENTS 



ISTumber 12 



Page 



Art. XXII.— a Newly Mounted Eporeodon ; by M. R. 



Thorpe. (With Plate I) 309 



Art. XXIII.— a Note on the Wedge Work of Pebbles; by 



C. K. Wentworth 313 



Art.XXIY. — On Concentric Drag-Folding in Alabama 



Marble ; by T. N. Dale 319 



Art. XXV. —Studies in the Cyperace^e; by T. Holm. 

 XXXII. Carices aeorastachyae : Phacotae nob. , and 

 Ternarige nob. (With 11 figures drawn from nature 

 by the author) 322 



Art. XXVI. — Native Antimony from Kern County, Cali- 

 fornia ; by C. H. Behre, Jr 330 



Art. XXVII— a New Merycoidodon ; by M. R. Thorpe 334 



Art. XXVIII.— The History of Corals and the "Limeless" 



Ocean ; by P. E. Raymond 343 



SCIENTIFIC INTELLIGENCE. 



Chemisiry and Physics. — A Rapid Process for the Determination of Phosphoric 

 Acid, H. CoPEAU : The Existence of Tetrahydrated Sodium Sulphate in 

 Mix- Crystals with Sodium Chromate, T. W. Richards and W. B. Meld- 

 RUM, 348. — A Textbook of Organic Chemistry, J. S. Chamberlain : Quan- 

 titative Chemical Analysis, H. B. Talbot, 349. — Volumetric Analysis for 

 Students of Pharmaceutical and General Chemistry, C. H. Hampshire : 

 Etalon Interferometer : The Wehnelt Interrupter, F. H. Newman, 350. — 

 Within the Atom, J. Mills, 851.— Mathematics for Students of Agri- 

 CTilture, S. E. Rasor, 352. 



Geology. — The Rift Valleys and Geology of East Africa, J. W. Gregory, 853.— 

 The Fish Fauna of the California Tertiary, D. S. Jordan : The Jurassic 

 Ammonite Fauna of Cuba, Marjorie O'Connell, 854. — A Text-book of 

 Geology, A. W. Grabau : Het Idjen-Hoogland. Monographie II, De Geo- 

 logic en Geomorphologie van den Idgen, G. L. L. Kemmerling, 856. — Het 

 Gouvernement Celebes, Proeve eener Monographie, L. van Vuuren : 

 Moseundersogelser i det Nordostliche Sjaelland, K. Jessen, 856. — The 

 Study of Geological Maps, Gertrude L. Elles, 857. — Geological Explo- 

 rations in Africa, 358. 



Miscellaneous Scientific Intelligence. — National Academy of Sciences: American 

 Association for the Advancement of Science: The Zoological Record, 1915- 

 1920, 358. — The Echinoderm Fauna of Torres Strait, Its Composition and 

 Its Origin, H. L. Clark, 359. — Readings in Evolution ; Genetics and 

 Eugenics, H. H. Newman : Philosophie des Organischen, H. Driesch : A 

 New Alaska Base Map, 360. — The Geography of Illinois, D. C. Ridgley: 

 La Geographie, 861. — A new map of the Pacific, 862. 



Obituary. — J. W. Spenoer, 368. —J. A. Allen: V. von Lang: J. von Hann, 

 M. A. Grandidier: A. S. F. Leighton: S. S. Voorhees, 364. 



Index: 365. 



