CONTENTS. 



Page 



Art. I. — A new Harmonic Analyzer; by A. A. Michelson 



and S. W. Stratton. (With Plate I.) 1 



II. — A New Form of Physical Pendulum; by J. S. Stevens 14 



III.— The Protostegan Plastron ; by G. R. Wieland. (With 



Plate II.) % 15 



IV. — The Granitic Breccias of the Cripple Creek Region ; by 



G. H Stone 21 



V. — Dispersion and Absorption of the Infra-Red Rays in 

 Rock Salt and Sylvine ; by H. Rubens and A. Trow- 

 bridge . _ . 33 



VI. — Studies in the Cyperacese^ VII ; by T. Holm 47 



VII. — X-Rays and Mineral Phosphorescence ; by J. E. 



Bl'RBANK 53 



VIII. — Phosphorescence produced by Electrification; by J. 



Trowbridge and J. E. Burbank 55 



IX. — Electromotive Force ; by J. Trowbridge 57 



X. — Surface Travel on Electrolytes; by W. E. Fiske and W. 



D. Collins 59 



XI. — Iron Meteorites, as nodular structures in Stony Meteor- 

 ites ; by H. L. Preston 62 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— Osmotic Pressure and Electrolytic Dissociation, Compton, 

 65. — Electronic Decomposition of Aqueous Solutions, Nernst. 66. — Direct 

 production of Iron Carbide, Moissan, 61. — Production of Peroxides in Slow 

 Oxidation, Bach, 68. — Constitution of Phosphorous acid, Michaeus and 

 Becker: Manufacture of Ammonium Cyanide, Lance, 69. — Jahresbericht uber 

 die Fortschritte der Chemie uud vervvandter Theile anderer Wissenschaften : 

 Change of alternating currents into direct, L. Graetz: Observation of air 

 waves, R. Emden, 70. — Light, visible and invisible, S. P. Thompson: Bibliog- 

 raphy of X-ray Literature and Research, 71. — Tafeln und Tabellen zur Dar- 

 stellung der Ergebnisse Spectroskopischer und Spectrophotometrischer Beo- 

 bachtungen, Th. W. Engelmank, 72. 



Geology and Natural History — Paleozoic faunas of the Argentine, E. Katser, 72. 

 — Volcanoes of North America, I. C. Russell. 74.— British Museum Cata- 

 logue: Coral Boring at Funafuti. 75. — Origin of the Diamonds of South 

 Africa, T. G. Bonnet, 76. — Les Diamants du Cap, L. De Launat, 77. —Build- 

 ing Materials of Pennsylvania, T. C. Hopkins: Catalogue of Minerals, A. 

 H. Chester: Synopsis Mineralogica, A. Weirbach: Eighth Annual Report 

 of the Missouri Botanical Garden, 78. — Catalogue Mammalium tam viventium 

 quam fossilium, 79. 



Miscellaneous Scientific Intelligence— Institute of France, Cuvier Prize: Mazama, 

 A Record of Mountaineering in the Pacific Northwest: Kleinasiens Natur- 

 sehatze, K. Kannenberg, 79. — Applied Mechanics, J. Perrt: Fifty-second 

 Annual Report of the Director of the Astronomical Observatory of Harvard 

 College for the year ending September 30, 1897, E. C. Pickering: Ostwald's 

 Klassiker der exakten Wissenschaften, 80. 



Obituary— Professor Winnecke: Rev. Samuel Haughton, D.D., 80. 



