CONTENTS. 



Page 



Art. VI. — Geometric Sequences of the Coronas of Cloudy 

 Condensation, and the Contrast of Axial and Coronal 

 Colors ; by C. Barus 81 



VII. — New Occurrence of Sperrylite; by H. L. Wells and 



S. L. Penfield ' 95 



VIII.— A Cosmic Cycle, Part II ; by F. W. Very._.__ .... 97 



IX. — Studies of Eocene Mammalia in the Marsh Collection, 



Peabody Museum ; by J. L. Wortman 115 



X. — Miniature Anemometer for Stationary ..Sound Waves; 



by B. Davis .... 129 



XI. — Occurrence of Fossil Remains of Mammals in the 

 Interior of the States of Pernambueo and Alagoas, 

 Brazil ; by J. C. Brannek. With Plate I ._. 133 



XII. — Estimation of Copper as Cuprous Sulphocyanide in 

 the Presence of Bismuth, Antimony, Tin and Arsenic; 

 by R. G. Van Name . . /_ 138 



XIII. — Composition of Yttrialite, with a Criticism of the 



formula assigned to Thalenite; by W. F. 1 1 ill k brand. ]45 



SCIENTIFIC INTELLIGENCE 



Chemistry and Physics — Apparatus for Determining the Density of Liquids, F. 

 Girardet: Supposed Existence of an Oxide of Hydrogen higher than the 

 Dioxide, Ramsay, 153. — Atomic Weight of Calcium Hinrichsex : Silver Sub- 

 halides, Kmszt: Atomic Weight of Tellurium, Kothner, 154. — Compounds of 

 Hydrogen Peroxide with Salts, S Taxatar: Drift of the Ether, W. M. Hicks: 

 Clearing of Troubled Solutions, G. Quincke: Displacement Currents, M. R. 

 Bloxdlot, 155. — Frequency-determination of slow Electrical Vibrations, K. E. 

 F. Schmidt: Bearing of the upward and downward movement of Air on 

 Atmospheric Electricity. F. Lixke: Notes on Quantitative Spectra of Beryllium, 

 W. N. Hartley, 156. — Vector Analysis, E. B. Wilsox. 15S. 



Geology and Natural H istory— Catalogue of the Types and figured Specimens 

 in the Palseontological collection of the Geological Department, American 

 Museum of Natural History, R. P. Whitfield and E. 0. Hovey, 159.— Lacco- 

 liths of the Black Hills, T. A. Jaggar, Jr , 160. — Analcite in Igneous Bocks, 

 J. W. Evans: Researches on Cellulose, 1895-1900, C. F. Cross and E. J. 

 Bevan, 161. — Memorial Greenhouses at the Harvard Botanic Garden, 162. 



Obituary— Clarexce King, 163. — Alphecs Hyatt: Thomas Meehan, 164. 



