CONTENTS 

 Original Papers 



Page 



Physics — The spectral photoelectric sensitivity of molybdenite as a function 

 of the applied voltage. W. W. Coblentz and H. Kahler 537 



Geochemistry — The oxidation of lava by steam. J. B. Ferguson 539 



Botany — History of the Mexican grass, Ixophorus unisetus. A. S. Hitchcock 546 



AnSTRACTS 



Geodesy 552 



Physics 553 



Botany 553 



Ornithology 554 



Chemical Technology 558 



Proceedings 

 Botanical Society 559 



Scientii»ic Notes and News 562 



