CONTENTS 



Original Papers 



Page 

 Botany. — A phytogeographical survey of southern Maryland. Roland M. 

 Harper ; 581 



Plant Physiology. — The reactions of soils supporting the growth of certain 

 native orchids. Edgar T. Wherry 589 



Ethnology.— A unique form of prehistoric pottery. J. Walter Fewkes 598 



Abstracts 



Ornithology 602 



Engineering 609 



Proceedings 



Entomological Society of Washington 610 



Scientific Notes and News. . .7 611 



