VI CONTENTS. 



Number 208. 



Page 



Art. XXX.- — Circulatory System in the Halemaumau Lava 



Lake during the Summer of 1911 ; by F. A. Perret 337 



XXXI. — Oligocene of the Roanne Basin and Its Vertebrate 



Fauna ; by C. Deperet 350 



XXXII. — Rate of the Reduction of Mercuric Chloride by 



Phosphorous Acid ; by G. A. Linhart 353 



XXXIII. — Sky Radiation and the Isothermal Layer ; by F. 



W. Very _ 369 



XXXIV — Deviation Produced by Prisms ; by H. S. Uhler 389 



XXXV.— Shinarump Conglomerate ; by H. E. Gregory 424 



XXXVI. — Danger to be Guarded Against in Making Mineral 

 Separations by Means of Heavy Solutions ; by W. F. 



HlLLEBRAND ._..__ 439 



XXXVII. — Two Varieties of Calciovolborthite (?) from 

 Eastern Utah ; by W. F. Hillebrand and H. E. Merwin 441 



XXXVIII. — Some Interesting Mineral Occurrences at 

 Princeton, N. J. ; by A. C. Hawkins 446 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Transmutation of Elements, Sir W. Ramsay, etc., 

 451. — Active Form of Nitrogen, Strutt, 452. — Interference of X-rays, TV. 

 Friedrich, etc., 454. — Researches in Colour Vision and the Trichromatic 

 Theory, Sir W. de W. Abney : Eadiam and Radioactivity, A. T. Cameron, 

 456.— Spectroscopy, E. C. C. Baly 3 457. 



Geology and Mineralogy — Eurypterida of New York, J. M. Clarke and R. 

 Ruedemann, 458. — Correlation of the Devonian system of the Rock 

 Island region, W. Elmer Ekblaw : Untermeerische Gleitung bei Trenton 

 Falls (Nord-Amerika) und ihr Verhaltniss zu ahnlichen Storungsbildern, F. 

 F. Hahn : Annual Reports Iowa Geological Survey, 460. — Bureau of Eco- 

 nomic Geology and Technology, Texas, W. B. Phillips : Bulletin Wis- 

 consin Geological and Natural History Survey, F. T. Thwaites, 461. — 

 Bulletin State Geological Survey of Wyoming : Bulletin State Geological 

 and Biological Survey of South Dakota : Brief Notices of some recently 

 described Minerals, 462. — Text Book of Petrologv ; The Sedimentary Rocks, 

 F. H. Hatch and R. H. Rastall, 464. 



Miscellaneous Scientific Intelligence — Year-Book Carnegie Institution of 

 Washington, R. S. Woodward, 465.— Publications of the Carnegie Insti- 

 tution, 466. — Man : A History of the Human Body, A. Keith : Growth of 

 Groups in the Animal Kingdom, R. E. Lloyd : Genetics ; An Intro- 

 duction to the Study of Heredity, H. E. Walter, 467. — Fatty Foods ; 

 their Practical Examination, E. R. Bolton and C. Revis, 468. 



Obituary— J. S. Billings, 468. 



