CONTENTS 

 Original Papers 



Page 

 Physiological Chemistry. — Chemical structure and physiological action. C. L. 



Alsberg 321 



Petrology. — Petrography of a lamprophyre dike cutting a pyrite body in Boyd Smith 



Mine, Louisa County, Virginia. Thomas L. WaTson 341 



Abstracts 



Optics 345 



Petrology 346 



Zoology 346 



Entomology 346 



Proceedings 



Philosophical Society 347 



Scientific Notes and News 361 



