Vlll CONTENTS. 



Number 234. 



Art. XLIII. — Vertebrate Fossils of Rock Creek, Texas ; by 



E. L. Troxell. (With Plate IX).,.. 613 



XLIV. — Volumetric Determination of Polythionic Acids by 



Potassium Iodate ; by G. S. Jamieson 639 



XLV. — Datolite from Great Notch, New Jersey; by C. W. 



Cook and E. H. Kraus ._ _. 642 



XLVI. — Fully Exposed Reef of Calcareous Algae (?) in the 



Middle Cambrian of the Teton Mountains ; by E. 



Blackwelder ._ 646 



XL VII. — Limestone Solution on the Bottom of Lake Ontario; 



by E. M. Kindle _ _. 651 



XL VIII.— Certain Points in Petrographic Classification; by 



W. Cross 657 



XLIX. — Separation of Magnesium from Lithium by Means 



of Ammonium Carbonate in Alcoholic Solution; by J. 



G. Dinwiddie . _ _ 662 



L. — Extrusive Basalt of Cambrian Age in the Blue Ridge of 



Virginia; by T. L. Watson and J. H. Cline 665 



LI. — Identity of Footeite with Connellite together with the 



Description of two new Occurrences of the Mineral; by 



W. E. Ford and W. M. Bradley '. 6*70 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Fixation of Atmospheric Nitrogen, W. S. Landis, 

 676.— Electroplating with Cobalt, H. T. Kalmus, C. H. Harper, and W. 

 L. Savell: Use of Mercuric Oxide for Standardizing Volumetric Solu- 

 tions, M. A. Abelmann: Manual of Practical Physical Chemistry, F. W. 

 Gray, 677. — Practical Physical Chemistry, A. Findlay: Molecular Asso- 

 ciation, W. E. S. Turner: X-Rays and Crystal Structure, W. H. and W. 

 L. Bragg, 678. — Elementary Chemical Microscopy, E. M. Chamot, 679. — 

 Hancock's Applied Mechanics for Engineers, N. C. Riggs: Electricity for 

 the Farm, F. I. Anderson, 680. 



Geology — Geology of the North American Cordillera at the Forty-ninth 

 Parallel, R. A. Daly: Florida State Geological Survey, E. H. Sellards, 

 681. — Biennial Report of Topographic and Geologic Survey of Pennsyl- 

 vania for the two years ending June 1, 1914: Geological Survey of Illinois, 

 J. A. Udden : Publikationer fra det Danske Meteorologiske Institut, C. 

 Ryder, 682. —Dew-Ponds; History, Observation and Experiment, E. A. 

 Martin; Union of South Africa, Department of Mines and Industries: Fos- 

 sil Birds in the Marsh Collection, C. W. Shupeldt, 683. 



Miscellaneous Scientific Intelligence — Report on the Starfishes of the West 

 Indies, Florida, and Brazil, etc., A. E. Verrill 3 684. — American Hydroids, 

 Part III ; The Campanularidae and the Bonneviellidre, C. C. Nutting: 

 Nahrungsmittelchemie in Vortragen, W. Kerp, 684. — Leavening Agents, 

 N. Hart: Mining World Index, Vol. VI: Museum of the Brooklyn Institute 

 of Arts and Sciences: Report of Board of Scientific Advice for India, 1913— 

 1914, 685. 



Obituary— S. Smith, 685.— W. G. Adams: E. Fraas: E.-H. Amagat, 686. 

 Index, 687. 



