CONTENTS. 



Page 



Art. I. — Experimental Investigation into the " Skin "-effect 



in Electrical Oscillators ; by C. A. Chant . _ _ 1 



II. — Influence of Hydrochloric Acid on the Precipitation of 



Cuprous Sulphocyanide ; by R. G. Van Name 20 



III. — Action of Ammonium Chloride upon certain Silicates ; 



by F. W. Clarke and G. Steiger _ _ . 27 



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



Peabody Museum ; by J. L. Woetman _ 39 



V.— A Cosmic Cycle ; by F. W. Very ._ 47 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Chemical Reactions produced by Radium, Berthelot, 

 59. — Preparation of Nitrogen from Ammonium Nitrate, J. Mai: Atomic Weight 

 of Tellurium, Pellini: Artificial Spinel, Dufaf, 60 — Size of the Sulphur 

 Molecule, Biltz and Preuner: Direct Gravimetric Method for the Estimation 

 of Boric Acid, Partkeil and Rose: Pressure of Light, E. L. Nichols, G. E. 

 Hull and P. Lebedew, 61. — Chemical Effects produced by Radium Radiations, 

 H. Becqoerel: Induction Coil, Lord Rayleigh: Resistance in High Vacua, W. 

 Rollins, 62. — Studies from the Chemical Laboratory of the Sheffield Scientific 

 School, H. L Wells, 63. — Light; A Consideration of the more familiar 

 Phenomena of Optics, C. S. Hastings, 64. 



Geology and Mineralogy — Lamarck, the founder of Evolution, his life and work, 

 with translations of his writings on Organic Evolution, A, S. Packard, 65. — 

 Congres Geologique international ; Compies Rendus de la VHP session, en 

 France, A. Gaudry and C. Barrois, 67. — Preliminary Description of the 

 Geology and Water Resources of the Southern Half of the Black Hills and 

 adjoining Regions in South Dakota and Wyoming, N. II. Darton, 68. — Newark 

 System of Pomperaug Valley, Connecticut, W. H. Hobbs and F. H. Knowlton : 

 Influence of Winds upon Climate during the Pleistocene Epoch, F. W. Harmer, 

 70. — Relative Density of Fluid and Solid Magmas, 71. — Siebengebirge am 

 Rhein, H. Laspeyres: New Mineral Names, 72. — Mineralogy of California, 

 A. S. Eakle and W. C. Blasdale: New localities of Nephrite, A. Dieseldorff, 

 73. — World's Largest Diamond, 74. 



Zoology and Botany — Reports on the Natural History of Porto Rico, 75. — 

 Alcyonaria of Porto Rico, C. W. Habgitt and C. G. Rogers: Mollusca of 

 Porto Rico. W. H. Dall and C. T. Simpson : Birds of North and Middle 

 America, R. Ridgeway: Capillaranalyse beruhend auf Capillaritats- und 

 Adsorptionserschemungen, mit dem Schlusskapitel : das Emporsteigen der 

 Farbstoffe in den Pflanzen, F. Goppelsroedek, 78. — Plant Life of Alabama, 

 C. Moiir. 79. 



Astronomy — Leonids in 1901: Leonids at Phoenix, Arizona, D. S. Landis, 79. — 

 Leonids at Bavre, Montana, C. W. Ling, 80. 



