CONTENTS. Vll 



Number 89. 



Page 

 Art. XXXIV. — Apertures of Coronas, in Relation to the 



Number of Nuclei and their Size ; by C. Barus 335 



XXXV. — Klamath Mountain Section, California ; by J. S. 



Diller 342 



XXXVI. — Rotatory Polarization Mechanically Produced ; 



by A. W. Ewell 363 



XXXVII. — Use of the Zinc Reductor in the Estimation of 



Vanadic Acid ; by F. A. Gooch and R. D. Gilbert.. _ 389 



XXXVIII. — Composition of some Canadian Amphiboles ; 



by B. J. Harrington 392 



XXXIX.— Andover Meteorite ; by H. A. Ward 395 



XL. — Pseudo-Serpentine from Stevens County, Washington ; 



by F. W. Clarke 397 



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



Peabody Museum ; by J. L. Wortman 399 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Atomic Weight of Caesium, Richards and Archi- 

 bald : Conductivity Produced in Gases by the aid of Ultra- Violet Light, 

 Townsend : Absorption of Gravitation Energy by Radio-active Substances, 

 W. Kaufmann, 415. — Emanations of Phosphorus, G. C. Schmidt : Posi- 

 tion of Eadium in the Periodic System, R. Runge and J. Precht : Charge 

 on the Ion, produced in air by Roentgen Rays, H. A. Wilson : Reversed 

 Lines of Metallic Vapor produced in Narrow Capillaries of Glass or 

 Quartz, 416. 



Geology and Natural History — New Mineral Names : Les Richesses Minerales 

 de L'Afrique, L. DeLaunay, 417. — Glacial Geology of New Jersey, R. D. 

 Salisbury : Birds of North and Middle America, R. Ridgway : List of 

 North American Lepidoptera and Key to the Literature, H. G. Dyar : 

 Synopsis of the Family Veneridae and of the North American Recent 

 Species, W. H. Dall, 418. 



Obituary — Professor Henry Barker Hill : Dr. Albert Huntington 

 Chester : George E. Belknap. 



