Vlll CONTENTS. 



Number 228. 



Page 

 Art. XLII. — Reconnaissance of a Portion of the Little Colo- 

 rado Valley, Arizona ; by H. E. Gregory _ 491 



XLIII.— Mineral Notes ; by W. E. Ford _ 502 



XLIV. — Medusina Walcotti, a Carboniferous Jellyfish ; by 



E. H. Barbour _ 505 



XLV. — Carboniferous Eurypterids of Nebraska ; by E. H. 



Barbour 507 



XLVI. — Passing of a Connecticut Rock Shelter ; by G. G. 



MacCurdy (With Plate IV) 511 



XL VII. — Succession of Faunas at Levis, P. Q. ; by P. E. 



Raymond _.. 523 



XLVI1I. — Fossil Frogs of North America ; by R. L. Moodie 531 

 XLIX. — Modifications of the Reduction Test for Tungstic 



Acid ; by G. Torossian 537 



L. — Distribution of the Active Deposit of Actinium in an 



Electric Field ; by A. N. Lucian 539 



LI. — Amherst Eclipse Expedition ; by D. Todd 556 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — New Volumetric Method for the Determination of 

 Cobalt in the Presence of Nickel, A. Metzl : Hydrogenization of Oils, C. 

 Ellis : Methods of Quantitative Organic Analysis, P. C. E. Kingscott 

 and R. S. G. Knight, 558. — Essays and Addresses, J. C. Brown: Metal- 

 lurgy, H. Wysor : Introduction to Organic Chemistry, J. T. Stoddard, 

 559.— An Introduction to the Study of Organic Chemistry, H. T. Clark: 

 Relation between Absorption and Wave length of X-rays, M. Siegbahn, 

 560. — X-ray Spectrum of Platinum, H. Seemann, 561. — Spectroscopy of the 

 Extreme Ultra-violet, T. Lyman : Elementary Electricity and Magnetism, 

 W. S. Franklin and B. Macnutt, 562. 



Geology and Mineralogy — The Climatic Factor as Illustrated in Arid America, 

 E. Huntington, etc., 563 — Connecticut Geological and Natural History 

 Survey : Recent Eruptions of Lassen Peak, J. S. Diller, 567. — West 

 Virginia Geological Survey : Production of Platinum, D. T. Day, 568. 



Astronomy — Theory of the Moon's Motion, E. W. Brown, 569. 



Miscellaneous Scientific Intelligence — Antiquity of Man in Europe, J. Geikie, 

 571. — Award of the Medal of the Royal Society of London : National 

 Academy of Sciences : American Association for the Advancement of 

 Science : British Association for the Advancement of Science : Food Pro- 

 ducts, H. C. Sherman, 572. — Sarawak Museum Journal : Mining World 

 Index of Current Literature, 573. 



Obituary — T. N. Gill : H. Gannett : A. Weismann, 573. 

 Index, 574. 



