CONTENTS. 



Page 

 Art. XXII. — Pleistocene Ground Sloth, Mylodon harlani, 



from Rock Creek, Texas ; by R. S. Lull.. 327 



XXIII. — Simple and Inexpensive Apparatus for Tidal 



Analysis ; by E./>V. Brown, F.R.S. . . 386 



XXIV. — Radio-active Content of Certain Minnesota Soils; 



b}^ J. C. Sanderson _ _ 391 



XXV. — Use of Hydrochloric Acid in the Estimation of Cer- 

 tain Forms of Organic Nitrogen ; by W. A. Drushel 

 and M. M. Brandegee 398 



XXVI.— Supposed Vanadic Acid from Lake Superior is Cop- 

 per Oxide ; by W. T. Schaller 404 



XXVII.— The System Anorthite-Forsterite-Silica; by O. 



Andersen __ 407 



XXVIII. — Studies on the Etched Figures of Japanese 



Quartz ; by S. Ichikawa. (Plates II to VII) 455 



XXIX. — Datolite from North Plainfielcl, Somerset County, 



New Jersey ; by A. C. Hawkins 473 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Production of CMoropicrin from Organic Com- 

 pounds, R. L. Datta and N. R. Chatterjee: Determination of Gasolene 

 Vapor in Air, G. A. Burrell and A. W. Robertson, 475. — Transmutation 

 of the Chemical Elements, W. P. Jorissen and J. A. Vollgraff: Chemis- 

 try of Cyanogen Compounds, H. E. Williams: Chemie der hydraulischen 

 Bindmittel, H. Kuhl and W. Knothe, 476. — Diffusion of Gases through 

 Mercury Vapor, W. Gaede. 477. — Blektrische Spektralanalyse chemischer 

 Atome, J. Stark: Advanced Electricity and Magnetism, W. S. Franklin 

 and B. MacNutt, 480. 



Geology and Mineralogy— Canada, Department of Mines, Geological Survey 

 Branch, R. W. Brock, 481. — State Geological Survey of Illinois: Further 

 Notes on Meteor Crater, Arizona, D. M. Barringer, 482.— New Meteorites, 

 O. C. Farrington: Neues Jahrbuch fur Mineralogie, etc.; Festschrift Max 

 Bauer zum seibzigsten Geburtstage gewidmet: Amethysts in Egypt, 483. 



Miscellaneous Scientific Intelligence. — Carnegie Institution of Washington, 

 Year Book No. 13, 1914 : Report of the Librarian of Congress, H. 

 W. Putnam, etc. — Text-book of Embryology, W. Heape, 485. — Neue 

 Grundlagen der Logik, Arithmetik und Mengenlehre, J. Konig: United 

 States Coast and Geodetic Survey: The Smithsonian Institution, W. H. 

 Dall, 486. 



Obituary— J. Geikie : G. F. J. A. Auwers : C. E. Bessey : L. L. Dyche, 

 486. 



