CONTENTS 



Art. XXX. — The columnar structure in the igneous rock on 



Orange Mountain, New Jersey ; by J. P. Iddixks. 



(With Plate IX), .... .* 321 



XXXI. — Larval Theory of the Origin of Tissue ; by A. 



Hyatt, 332 



XXXII. — Cretaceous Metaraorphic Rocks of California ; by 



G. F. Becker, 348 



XXXIII.— Arnold Guyot, , 358 



XXXIV. — Determination of Fossil Dicotyledonous Leaves ; 



by L. F. Ward, .-_ „ 3 70 



XXXV. — Pseudomorpbs of Limonite after Pyrite ; by E. G. 



Smith, 376 



XXXVI. — Influence of Motion of the Medium on the Velocity " 



of Light; by A. A. Michelson and E. W. Morlet,... 377 

 XXXVII. — Note on the Structure of tempered Steel ; by C. 



Bartjs and V. Strouhal, 386 



XXXVIII. — Brookite from Magnet Cove, Arkansas ; by S. 



L. Penfield, 387 



SCIENTIFIC INTELLIGENCE. 



Physics and Chemistry. — Critical Temperatures and Pressures of certain Gases, 

 Vincent and Chappuis, 389.->— Double Refraction produced by Metallic films. 

 Kundt, 390. — Continuous production of Oxygen by the action of Calcium 

 hypochlorite upon Cobalt oxide, Bidet: Direct fixation of Atmospheric Nitro- 

 gen by certain argillaceous Soils, Berthelot, 391. — Combustion of Carbon 

 monoxide and of Hydrogen, Dixon, 392. 



Geology and Natural History. — Gas- Wells on Antielinals, I. C.White, 393. — Volcano 

 of Barren Island in the Bay of Bengal, 394. — Eruption at Kilauea, Hawaii, in 

 March, 1886, 397 — Making deposits of the remains of birds, squirrels, and other 

 small animals, E. W. Hilgard. 398. — History of Taconic investigation previous 

 to the work of Professor Emmons, J. D. Dana, 399. — Fifth Annual Report of the 

 U. S. Geological Survey, 1883-84, J. W. Powell, 401.— The work of the Interna- 

 tional Congress of Geologists and its Committees, Persifor Frazer : Masto- 

 don, Llama, etc., from Florida, Leidt : Fossil leaves in Staten Island and Long 

 Island Clay beds : Systematische Ubersichfc der fossiler Myriapoden, Arachnoi- 

 deen und Insecten, von S. H. Scudder, «403. — Higher Devonian Faunas of 

 Ontario Co., N. T., J. M, Clarke : Fossil Ostracoda from Colorado, T. Rupert 

 Jones : The Tripyramidal Slides of 1885, A. A. Butler, 404 — Titanichthys 

 and Dinichthys from the Devonian of Ohio : Catalogue of the Fossil Mamma- 

 lia in the British Museum, R. Lydekker : Discussion on Climate and Cosmol- 

 ogy, J. Croll: Allgemeine und chemische Geologie von Justus Roth: Crystal- 

 line slag having the composition of Fayalite, E. Claassen, 405. — Journal of the 

 Trenton Natural History Society: Recent Notes from Botanische Zeitung, 406. 



Astronomy. — Popular History of Astronomy during the Nineteenth Century, A. M. 

 Clerke, 406. — The Star-guide, L. Clark and H. Sadler : Photographic Study 

 of Stellar Spectra, 407. 



Miscellaneous Scientific Intelligence. — The Fisheries and Fishery Industries of the 

 United States, G. B. Goode, 407. — Outlines for a Museum of Anatomy, R. W. 

 Shufeldt: Earthquakes in New England, W. M. Davis: Medals of the Geo- 

 logical Society : Medal of the Astronomical Society of London, 408. 



