CONTENTS 



Original Papers 



Page 

 Physics. — Low voltage discharge in sodium vapor. Paul D. Foote and 



F. L. MoHLER 513 



Botany. — A sketch of botanical activity in the District of Columbia, — II. 



Bibliography. P. L. Ricker 516 



Botany. — Chenopodium nuttalliae, a food plant of the Aztecs. W. E. 



Safford 521 



Biology. — The biological significance of false witches '-brooms in Ericaceous 



plants. Jean Dufrenoy 527 



Zoology. — A key to the subspecies of Leptopoma nitidum Sowerby of the 



Philippine Islands. Paul Bartsch 532 



Abstracts 



Radiometry 536 



Metallurgy 537 



Geology 637 



Ornithology 540 



Proceedings 



Biological Society of Washington 642 



SciENTiPic Notes and News \ 543 



