CONTENTS 



Original Papers 



Pago 



Physical Chemistry. — Further experiments on the volatilization of plat- 

 inum. G. K. Burgess and R. G. Waltenberg 365 



Petrology. — Note on the lithophysae in a specimen of obsidian from Cali- 

 fornia. F. E. Wright 367 



Botany. — Proposed classification of the genus Rollinia, with descriptions of 

 several new species. W. E. Safford 370 



Zoology. — Ophiomaria, a new genus of ophiurans from southern South 

 America and the adjacent portion of the Antartic Continent. Austin 

 H. Clark 384 



Physiology. — Food Economics. Graham Lusk 387 



Abstracts 



Terrestrial Magnetism 397 



Physics 398 



Spectroscopy 399 



Geology 400 



Botany 401 



Proceedings 



The Philosophical Society 402 



The Geological Society 404 



The Biological Society 406 



The Anthropological Society 407 



