IV CONTENTS. 



Number 158. 



Page 

 Art. VII. — Revision of the Protostegidae ; by G. R. Wieland. 



(With Plates II-IY) 101 



VIII. — Submarine Eruptions of 1831 and 1891 near Pantel- 



leria ; by H. S. Washington _ _ _ . 131 



IX. — Types of Permian Insects; by E. H. Sellards .._ 151 



X. — Iodometric Estimation of Vanadic Acid, Chromic Acid 



and Iron in the Presence of One Another ; by G. Edgar 174 



XI. — Analysis and Chemical Composition of the Mineral 



War wickite ; by W. M. Bradley . _ 179 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Question of Change in Total Weight of Chemically 

 Eeacting Substances, H. Landolt : Volume of Eadium Emanation, 

 Eutherford, 185. — New Method for Separating Tungstic and Silicic 

 Oxides, Defacqz : Silicide of Uranium, Defacqz : New Periodic Func- 

 tion of the Atomic Weight, V. Poschl, 186. — Velocity of Eontgen Eays ; 

 also their Influence on the Brush Discharge, E. Marx : Eadiation of 

 Uranium X, H. W. Schmidt : Influence of Self Induction on Spark 

 Spectra, G-. Berndt : Ionization of Gases by Spark and Arc, H. Eausch, 

 187. — Investigations in Eadiation, W. W. Coblentz and P. G. Nutting, 

 18& 



Geology — Twenty-ninth Annual Eeport United States Geological Survey, 

 G. 0. Smith, 188. — Geological Survey of New Jersey, H. B. Kummel : 

 Sketch of the Geography and Geology of the Himalaya Mountains and 

 Tibet, S. G. Burrard and H. H. Hayden, 189.— Gases in Eocks, E. T. 

 Chamberlin, 190. 



Botany and Zoology — Forest Flora of New South Wales, J. H. Maiden, 

 191 — Jaarboek van het Department van Langbouw in Niederlandsch- 

 Indie, 1907: Origin of Vertebrates, W. H. Gaskell. 192.— Ticks: a 

 Monograph of the Ixodoidea, G. H. F. Nuttall, C. Warburton, W. 

 F. Cooper, and L. E. Eobinson : Animal Eomances, G. Eenshaw : Essays 

 on Evolution, E. B. Poulton, 193. — Parasitology, G. H. F. Nutall and 

 A. E. Shipley, 194. 



Miscellaneous Scientific Intelligence — New Goniometer Lamp, F. E. Wright, 

 194. — Containing Device for Salts Used as Sources for Monochromatic 

 Light, F. E. Wright, 195. — Eeport of the Secretary of the Smithsonian 

 Institution for the year ending June 30, 1908, 196. 



Obituary— G. W. Hough, 196. 



