CONTENTS. 



Page 



Art. XII. — Molluscan Archetype considered as a VeligeT- 

 like Form, with discussions of certain points in Mollus- 

 can Morphology; by A. E. Verrill . 91 



XIII. — Geologic Efficacy of Alkali Carbonate Solution ; by 



E. W. HiLGARD 100 



XIV. — Apparatus for the Rapid Determination of the Sur- 

 face Tensions of Liquids ; by C. E. Ltnebarger 108 



XV. — Northupite ; Pirssonite, a new mineral ; Gaylussite 

 and Hanksite from Borax Lake, San Bernardino County, 

 California; by J. H. Pratt ._ 123 



XVI. — Bearpaw Mountains of Montana. Second Paper; 



by W. II. Weed and L. V. Pirsson .._ ._. 136 



XVII. — Composition and structure of the Hamblen County, 



Tennessee, Meteorite; by G. P. Merrill 149 



XVIII. — Wardite ; a New Hydrous Basic Phosphate of 



Alumina; by J. M. Davison • 154 



XIX. — lodometric Estimation of Molybdic Acid ; by F. A. 



GoocH and C. Fairbanks 156 



XX. — Existence of Selenium Monoxide; by A. W. Peirce. 163 



SCIENTIFIC INTELLIGKNCE. 

 Geology and Mineralogy— AnticVmoYmm and Synclinorium, 168. — Transactions 

 of the Geological Society of South Africa, D. Draper: Rubies of Burma, C. B. 

 Brown and J. W. Judd, 169. 



Obituary — Sir Joseph Prestwich, D.C.L., F.E,.S., 170. 



