VI CONTENTS. 



Miscellaneous Scientific Intelligence. — Beitrage zur Geophysik, G. Gerland, 344. 

 Klima and Gestaltung der Erdobcrfiache in ihrer Wechselwii'kung dargestellt 

 von J. Probst : Beobachtungs-Ergebnisse der Norwegischcn Polarstation 

 Bossekop in Alten, A. S. Steen : The Asteroids, or Minor Planets between 

 Mars and Jupiter, D. Kirkwood : Manual of Descriptive Geometry, C. A. 

 Waldo, 345 — Annals of the Astronomical Observatory of Harvard College, E. 

 C. Pickering: Movements of the Earth, J. N Lockyer: Publications of the 

 Lick Observatory of the University of California, E. S. Holden: Cordoba 

 Observations : Elementary Treatise on Analytical Mechanics, W. G. Peck, 346. 



Obituary. — James C. Booth, 346. 



Number 209. 



Pa* 



Art. XXX. — The Absolute Wave-length of Light ; by Louis 



Bell. Part II 347 



XXXI. — Three Formations of the Middle Atlantic Slope; 



by W. J. McGee. (With Plates VI and VII) 367 



XXXII. — On some peculiarly spotted Rocks from Pigeon 



Point, Minnesota ; by W. S.* Batlet 388 



XXXIII. — The Taconic System of Emmons, and the use of 

 the name Taconic in Geologic nomenclature ; by Chas. 

 D. Walcott _..._. 394 



XXXIV. — Terminal Moraines in North Germany ; by Pro- 

 fessor R. D. Salisbury . 401 



XXXV. — Note on the Viscosity of Gases at High Tempera- 

 tures and on the Pyrometric use of the principle of Vis- 

 cosity ; by Carl Barus '. 407 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Boiling-point and molecular formula of Stannous chloride, 

 Biltz and Victor Meter: Occurrence of Germanium in Euxenite, Kruss, 

 410. — I'ouble Acetate of calcium and copper, Rudorff : Ueber die Reaktions- 

 geschwiudigkeit zwischen islandischem Doppelspat und einigen Sauren, W. 

 Spring: Integral Weight of Water, T. S. Hunt. 41 1. — Absorption Spectra, Fr 

 Stexger. 412. — Wave-length of the two red lines of potassium: Explosion of 

 gases, A. von CEttingen and A. von Gernet: Dust particles in the Atmos- 

 phere, John Aitkin, 413. —Magnesium and Zinc, Hirn: Gravity, 414. 



Geology and Mineralogy — Geology-: Chemical, Physical and Stratigraphical, J. 

 Prestwich, 414. — Level-of-no»strain and mountain making: (Jeology of Rhode 

 Island; Franklin Society Report: Annual Report for 1886 of the Geological 

 Survey of Pennsylvania: Annuaire Geologique universe!, Revue de Geologie et 

 Paleontologie. 415. — The Geological Record for 1879, W. Whitaker and W. 

 H. Dalton: Manual of the Geology of India, Part IV, Mineralogy, F. It. 

 Mallet : Brief notes on recently described minerals, 4 1 6. — Note on Xantbitaue, 

 L. G. Eakins, 418. 



Botany and Zoology — Recent contributions to our knowledge of the vegetable cell, 

 Loew and Bokorky, 419. — Garden and Forest, C. S. Sargent: Bibliotheca 

 Zoologica, 420. — Report on the Annelids, of the Dredging Expedition of the TJ. 

 S. Coast Survey Steamer " Blake," E. Ehlers, 424. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 424. 



Obituary — Oscar Harger, 425. — Jules-Emile Planchon, 426. 



