IV CONTENTS. 



Nuinber 8. 



Page 



Art. XII. — Molliiscan Archetype considered as a Veliger- 

 like Form, with discussions of certain points in MoUus- 

 can Morphology ; by A. E. Veerill 91 



XIII. — Geologic Efficacy of Alkali Carbonate Solution ; by 



E. W. HlLGARD _ 100 



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

 face Tensions of Liquids ; by C. E. Linebarger 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. H. Weed and L. V. Piesson 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 INTELLIGRNCE. 



i Geology and Mineralogy — Anticlinorium and Synclinorium, 168. — Transactions 



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

 i Brown and J. W. Judd, 169. 



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



