CONTENTS. 



Page 

 Art. XLIII — Quantitative determination of Niobium ; by 



T. B. Osborne, 32ft 



XLIV. — Notes on the Surface Geology of the country border- 

 ing the Northern Pacific Railroad ; by J. S. Newbjebry, 337 



XLV. — Rainband Spectroscopy; by L. Bell, 347 



XLYL — A new Genus of Chazy Sponges, Strephochetus; 



by H. M. Seely, 355 



XL VII. — William B. Rogers's Geology of the Virginias. 



A Review ; by J. L. and H. D. Campbell, 357 



XL VIII. — Displacement through intrusion; by J. D. Dana, 374 

 XLIX. — An Endoparasite of Noteus; by Sara G. Foulke,. 377 

 L.— Spectrum of Nova Andromedre ; by O. T. Sherman, 378 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Determination of the Specific Density of Liquids at 

 high temperatures?, E. Schiff, 380. — Direct union of Bromine with Chlorides, 

 forming a new class of Perbromides, Berthelot: Reduction of Carbon dioxide 

 to monoxide by Carbon, Naumaxn and Pistor, 381. — Decompositiou of Carbon 

 dioxide by the Electric Spark, Dixon and Lowe, 383. — Direct Synthesis of 

 Benzene Derivatives by the action of Potassium on Carbon monoxide, Nietzki 

 and Bexckiser, 384. — Composition of Ocean water, W. Dittmar, 385. 



Geology and Mineralogy. — Development of Crystallization in Igneous rocks of 

 Washoe, Nevada, A. Hague and J. P. Iddings, 388. — Crystallographic Study 

 of the Thinolite from Lake Lahontan, E. S. Dana, 390. — Geology of the 

 Scottish Highlands, Judd, 392. — Results of the fusion of pyroxene and horn- 

 blende minerals, 395 — An effect near Merak, ou western Java, of the Krakatoa 

 Eruption : Geological and Natural History Survey of Minnesota for 1884, 

 N. H. TVinchell, 396. — Underground Temperatures, J. Prestwich, 397. — 

 Notes on the Stratigraphy of California, G. P. Becker, 399. — New American 

 Limuloid species from the Carboniferous, A. S. Packard : Embryology of 

 Limulus, A. S. Packard : Town Geology, the Lesson of the Philadelphia 

 Rocks. A. Heilprin, 401. — Einfiihrung in die Gesteinslehre, Ein Leitfaden fur 

 den akademischeh Unterricht und zum Selbststudiuin von A. v. Lasaulx : 

 Pyrargyrite and Proustite, E. Pethwisch: Marble Border of Western New 

 England : Die Meteoriten-Sammlung des k. k. mineralogischen Hof-Kabinetes 

 in Wien am 1. Mai 1885, von A. Brezina : Botany of the Challenger Expedi- 

 tion, 402. — Methods of Research in Microscopical Anatomy and Embryology, 

 C. 0. Whitman, 403. 



Astronomy. — The Star System 40, 6 l Eridani, A. Hall, 403. — Report No. 8 of the 

 Cincinnati Observatory, H. C. Wilson, 404. 



Miscellaneous Scientific Intelligence. — Washington Co., Penn., Meteorite, G. F. 

 Ktjnz, 404. — British Association at Aberdeen, 405. — Louis Agassiz, his Life 

 and Character, E. C. Agassiz : Hawaian or Sandwich Island Survey, W. D. 

 Alexander, 406. — Obituary. — Jas. Macfarlane: Thos. Bland, 40 7. — E. H. 

 von Baumhauer, 408. 



TEN-VOLUME INDEX. 



An extra number of this Journal, containing an index to volumes xxi to xxx, 

 of sixty pages or more, will be ready in January. The publication of this num- 

 ber involves a large extra expense to the editors, and it will be sent, therefore, 

 to those only who specially order it. The price is seventy-five cents per copy. 

 Orders are' solicited, as the edition will be a small one. 



