Vlll CONTENTS. 



Number 204. 



Page. 



Art. XL VI. — Destruction of the Passivity of Iron in Nitric 

 Acid by Magnetization ; by E. L. Nichols and W. S. 

 Franklin 419 



XL VII. — Method of making the Wave-length of Sodium 

 Light the actual and practical standard of length ; by 

 A. A. Michelson and E. W. Morlet ._ 427 



XL VIII. — Work of the International Congress of Geologists; 



by G. K. Gilbert . _ 430 



XLIX.— Existence of certain -Elements, together with the 

 discovery of Platinum, in the sun ; by C. C. Hutchins 

 and E. L. Holden 45 1 



L. — Flora of the Coast Islands of California in relation to 



recent changes of Physical Geography; by J. LeConte. 457 



LI. — Determination of " prevailing wind direction ;" by H. 



Allen Hazen 461 



LIL— New instrument for the measurement of Radiation; 



C. C. Hutchins 466 



LIIL — American Meteorites ; by G. F. Kunz. (With Plate 



X) 1 467 



LIV. — Mineralogical Notes ; by G. F. Kunz 477 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Study of Chemical reactions by means of Electrometer, 

 Boutt, 480.— Detection of minute traces of Carbon dioxide. Rossler, 481. — 

 Heat of Combination of Tellurium, Berthelot : Occurrence of Aluminum in 

 the Ashes of Flowering Plants, Toshida: Ammonio-cobaltic permanganates, 

 Klobb, 482. — Character of Solution, Mendelejeff, 483. — Chemical Action of 

 Bacterium Aceti, Brown : Light emitted by glowing solid bodies, 484. 



Geology and Mineralogy. — Location of some Vertebrate Fossil Beds in Honduras, 

 F. L. Nason, 485. — Professor Ward's Synopsis of the Flora of the Laramie 

 group, 487. — Pot-hole of remarkable size in Archbald, Pa : Lake Age in Ohio, 

 or some Episodes in the Retreat of the N. A. Glacier, 489 — Carboniferous 

 Fossil Corals: Primordial Fossils from Mt. Stephens. N. W. Territory of Canada, 

 Rominger : Teachings of Geography, Geikie : North Carolina Diamond, G. F. 

 Kunz: Uerderite: Periclasite, 490. 



Botany. — Monographic Phanerogamarum Prodromi, Planchon, 490. — Report on 

 Botanical Work in Minnesota for 1886 : Course of Practical Instruction in Botany : 

 Grasses of North America for Farmers and Students, W. J. Beal, 492. — Ser- 

 jania Sapindacearum Genus monographice descriptum, L. Radlkofer: Fish- 

 inebriating Plants : British Moss Flora: Pittonia, a series of Botanical papers, 

 E. L. Greene, 493. — Catalogue provisoire des Plantes Phanerogames et Oryp- 

 togames de la Basse Louisiane. A. B. Langlois : Development of the Ostrich 

 Fern, D. H. Campbell: Studi botanici sugli Agrumi e sulle piante affini, O. 

 Penzig, 494. — Elements of Botany, A. Gray: Elements of Botany, E. S. 

 Bastin, 495. 



Miscellaneous Scientific Intelligence. — National Academy of Sciences. 496. 



Obituary — Gustav Robert Kirchhoff, Oscar Harger, 496. 



Index to Volume XXXIV, 497. 



