CONTENTS 



Art. XVI. — Cambrian Fossils from Mount Stephens, North- 

 west Territory of Canada; by Charles D. Walcott.. 



XVII. — History of Changes in the Mt. Loa Craters ; by 

 J. D. Dana. Relations of Kilauea to Mt. Loa and 

 Contrast between Volcanoes of the Mt. Loa and Vesu- 

 vius types „ _ _ 



XVIII. — On the formation of the deposits of Oxides of 

 Manganese ; by F. P. Duxningtox _ _ 



XIX. — Maxwell's Theory of the Viscosity of Solids and 

 Certain Features of its Physical Verification; by Carl 

 Barus 



XX. — On the Origin of Primary Quartz in Basalt ; by Jo- 

 seph P. Iddixgs 



XXL — Mineralogical Notes ; by Geo. F. Kuxz 



Page 



161 



167 

 175 



178 



208 

 222 



SCIENTIFIC INTELLIGENCE. 



Miscellaneous Intelligence. — Explorations of the Gulf Stream. Lieut. J. E. Pills- 

 bury. 225. 



Obituary. — Henry Caryill Lewis. James Stevenson, Albert D. Hager, 226. 



APPENDIX. 



List of the Writings of Dr. Asa Gray, chronologically arranged. 



