CONTENTS. 



Page 



Art. XXX. — Formation and Distribution of Fluviatile and 



Marine Gravels; by H. E. Gregory _ . . 48V 



XXXI. — Coal Measures Amphibian with an Osseous Tarsus; 

 - by R. L. Moodie _ _. 509 



XXXII. — Contributions to Sardinian Petrography: I. The 



Rocks of Monte Ferru; by H. S. Washington 513 



XXXIII. — Estimation of Pentavalent Vanadium by Means 



of Sodium Thiosulphate; by G. O. Oberhelman 530 



XXXIV. — Development of the Mesenteries in the Zooids 

 of Anthozoa and its Bearing upon the Systematic Posi- 

 tion of the Rugosa; by T. C. Brown .... 5*35 



XXXV. — Use of the Roentgen Ray in Paleontology: Ski- 

 agraphy of Fossils; by R. M. Field. (With Plate VIII) 543 



XXXVI.— New Ordovician Eurypterid; by E. W. Shuler 551 



XXXVII.— New Mosasaur from the Ft. Pierre; by F. B. 



Loomis _ 555 



XXXVIII. — Growing Crystals for Measurement; by J. M. 



Blake ._ _ 1 5./ 



XXXIX. — Primary Analcite of the Crowsnest Volcanics; by 



J. D. MacKenzie _ 571 



XL. — New Genera of Permian Reptiles; by S. W. Williston 575 

 XLI. — Radium Content of Water from the Gulf of Mexico; 



by S. J. Lloyd 580 



XLII.— Mobilities of Ions in Air; by E. M. Wellisch 583 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Production and Uses of Hydrogen, A. F. Seeker, 

 600. — Density of Lead from Ceylon Thorite, F. Soddy, 601. — Analysis of 

 Alloys containing Tin, Antimony and Arsenic, F. A. Stief: Density and 

 Dispersion of Liquid Hydrogen and Nitrogen, H. Augustin, 602.— Absorp- 

 tion Spectrum of Chlorophyll, D. van Gulik: New Type of Band Series, 

 A. Fowler, 604. 



Geology — Problems of American Geology, W. N. Rice, etc., 605. — West 

 Virginia Geological Survey : Illinois Geological Survey, 607. —South 

 Dakota Geological Survey: Report of State Geologist on Mineral Industries 

 and Geology of Vermont, 1913-1914: Les Variations Periodiques des Gla- 

 ciers, XIX me Rapport, 1913, A. Hamberg et P. L. Mercanton< 608.— 

 Additional Facts in Regard to the Discovery of the Meteorites of Bren- 

 ham, Kiowa County, Kansas, J. W. Davis, 609. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 610. — 

 The Common Law and the Case Method in American University Law 

 Schools: Publications of the Allegheny Observatory of the University Of 

 Pittsburgh, 611. — Laboratory Manual for the Detection of Poisons and 

 Powerful Drug3 (W. Autenrieth), W. H. Warren: What is Adaptation ? 

 R. E. Lloyd, 612. 



Obituary— R. Lydekker: A. A. W. Hubrecht: A. S. Lea, 612. 



