IV CONTENTS. 



Number 92. 



Page 

 Art. XL — Mechanics ol" Igneous Intrusion. (Second Paper) ; 



by R. A. Daly 107 



XII. — Stellar Revolutions within the Galaxy: by F. W. Very 127 



XIII. — Little Cottonwood Granite Body of the Wasatch 



Mountains ; by S. F. Emmoivs _ , . . 139 



XIV. — Contribution to a List of the Fauna of the Stafford 



Limestone of New York ; by M. Talbot 148 



XV. — Formula of Bornite ; by B. J. Harrington 151 



XVI. — lodometric Determination of Gold in Dilute Solu- 

 tion ; by R. N . Maxson _ 155 



XVII. — Radioactivity of Thorium Minerals ; by G. F. 



Barker . _ 161 



XVIII. — Significance of Silicic Acid in Mountain Streams ; 



W. P. Headden.. -- 160 



SCIENTIFIC INTELLIGENCE. 



Geology and Mineralogy — U. S. Geological Survey : Batrachian and other 

 footprints from the Coal Measures of Joggins, N. S., G. F. Matthew : 

 Ueber Artinit, ein Iseues Mineral der Asbestgruben, von Val Lanterna, 

 L. Brugnatelli, 185. — Minerals from Leona Heights, Alameda Co , Cali- 

 fornia, W, T. Schaller; Palacheite, a new mineral, A. S. Eakle, 186. 



