IV CONTENTS. 



Number 74. 



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. Vert ... 97 



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



Peabody Museum ; by J. L. Woetman 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 Pernambuco and Alagoas, 

 Brazil ; by J. C. Brann-er. 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. Hillebrand. 145 



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, "Hinrichsen: Silver Sub- 

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

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

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

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

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

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

 W. N. Hartley, 156.— Vector Analysis, E. B. Wilson, 158. 



Geology and Natural History — Catalogue of the Types and figured Specimens 

 in the Palasontological 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 Rocks, 

 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 — Clarence King, 163. — Alpheus Hyatt : Thomas Meehan, 164. 



