CONTENTS TO "V ,UME XIII. 



Number 73. 



Page 

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



in Electrical Oscillators ; by 0. 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. Wortman 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, Dufau, 60. — Size of the Sulphur 

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

 of Boric Acid, Partheil and Rose : Pressure of Light, E. L. Nichols, G-. P. 

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

 H. Becquerel : 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 ; Comptes Rendus de la VIII e session, en 

 France, A. Gaudrt 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. H. Darton, 68. — Newark 

 System of Pomperaug Valley, Connecticut, W. H. Hobbs and P. H. Knowli jn: 

 Influence of Winds upon Climate during the Pleistocene Epoch, P. W. Hapmer, 

 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. Hargitt 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. Goppelsroeder, 78. — Plant Life of Alabama, 

 C. Mohr, 79. 



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

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



