CONTENTS 



Pag* 



ORiGmAi« Papbrs 



Geochemistry. — An unusual deposit of aragonite from sea water. Rogbr C. 

 Weixs 249 



Phs^cal Chemistry. — Reduction potentials of mixtures of indigo and indigo 

 white, and of mixtures of methylene blue and methylene white. Manspebld 

 Clark : 255 



Petrography. — Italite: a new leudte rock. Henry S. Washington 270 



Abstracts 



Paleontology 273 



Geology 273 



Proceedings 



Washington Academy of Sciences 274 



Philosophical Society of Washington 275 



Entomological Society of Washington 277 



Scientific Notes and News 283 



