CONTENTS TO VOLUME XXXVIII. 



Number 223. 



Page 



Art. I. — Revised Geologic Time-table for North America; 



by C. Schuchert and J. Barrell . , 1 



II. — Relations of the Alexandrian Series in Illinois and Mis- 

 souri to the Silurian Section of Iowa; by T. E. Savage 28 



III. — New Occurrence of Scapolite; by J, Stansfield 37 



IV. — Improvement of the Barium Sulphate Determination of 



Sulphur in Soluble Sulphates; by W. A. Turner 41 



V. — Unconformity in Narragansett Basin of Rhode Island and 



Massachusetts; by G. F. Loughlin and L. A. Hechinger 45 



VI. — Cordaitean Wood from Indiana Black Shale; by Marion 



G. Elkins and G. R. Wieland. (With Plates I and II.) 65 



VII. — Occurrence of Pyroxenite and Hornblendite in Bahia, 



Brazil; by H. S. Washington _ 79 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Atomic Weight of Lead from Ceylon Thorite, F. 

 Soddy and H. Hyman: Extraction of Germanium from the Waters of 

 Vichy, J. Bardet. — Acid Salts of Dibasic Acids, E. Jtjngfleisch and P. 

 Landrieu: Fluorsulphonic Acid, O. Ruff and H. J. Braun: Density and 

 Atomic Weight of Neon, A. Leduc: Chart of the Carbon Compounds, C. 

 W. Cuno, 92. — New X-Ray Spectrograph, M. de Broglie: Ultra-violet 

 Limit of the Solar Spectrum, A. Wigand, 93. — Change in a Lunar Crater, 

 W. H Pickering: Propagation of Light in Dispersing Media, A. Sommer- 

 feld and L. Brillouin, 95. — Two New Sciences, G. Galilei, 97. — Nor- 

 wegian Aurora Polaris Expedition, 1902-1908, Dr. Bibkeland, 98. 



Geology and Mineralogy — Geology of Saratoga Springs, Cushing and Ruede- 

 mann, 99. — Ontogeny of Paradoxides and Isotelus, Raymond: Development 

 in fossil Cephalopoda, J. P. Smith: Tanner's Creek section of Cincinnati 

 Series Indiana; Cumings and Galloway, 100.— Mud Cracks open under 

 Water, E. S. Moore, 101. — Engineering Geology, H. Ries and T. L. 

 Watson: U. S. Bureau of Mines, Holmes: Geological Survey Canada, 102. 

 — New Geologic Map of the State of New Jersey: Hawaiian Volcano 

 Observatory, 103. — Common Minerals and Rocks, Hobbs: Minerals of the 

 Black Hills, Ziegler: Kristallberechnung, Gossner, 104. 



Botany and Zoology — Weed Flora of Iowa, L. H. Pammel, 104. — Irritability 

 of Plants, J. C. Bose: Introduction to Botany, J. Y. Bergen and O. W. 

 Caldwell: Zentral-Afrika-Expedition 1907-1908.— Elementary Principles 

 of General Biology, J. F. Abbott: Biology. General and Medical. J. Mc- 

 Farland, 106. —Starfishes of the North Pacific Coast, A. E. Verrill: 

 Memoirs of the Queensland Museum, R. Hamlyn-Harris, 107. — Ungulate 

 Mammals in the British Museum: Annual Report Field Museum, 108. 



Astronomy and Mathematics — Introduction to Celestial Mechanics, F. R. 

 Moulton, 108 — Memorabilia Mathematica, R. E. Moritz : Allegheny 

 Observatory, 109. — U. S. Naval Observatory, Volume VIII: Observatory 

 of the University of Virginia: Carother's Observatory: Napier Tercen- 

 tenary Celebration: Logarithmic Tables, C. I. Moore, 110. 



Miscellaneous Scientific Intelligence — U. S. National Museum, R. Rathbun: 

 U. S. Coast and Geodetic Survey: Carnegie Institution of Washington, 

 111.— Annual Report Board of Scientific Advice for India 1912-13, 112.— 

 American Philosophical Society: San Francisco Meeting of A. A. A. S., 113. 

 — British A. A. S.: A Theory of Interest: Franklin Institute award Elliott 

 Cresson Medals: Science Reports of the Tohoku Imperial University, 114. 



Obituary — E. Suess, 115. — A. E. Barlow: A, F. Chamberlain: J. J. Myers: 

 P. H. Pye-Smith: J. W. Swan: M. P. E. L. Van Tieghem: K.Chun, 116. 



