TABLE OF CONTENTS 
NuMBER 1 (June 27, 1949) 
Degradation of Plant Remains in Organic Sedi- 
ments 
By Etso S. BarRGHOORN . 
NuMBER 2 (October 26, 1949) 
Plantae Colombianae XII 
By Ricuarp Evans SCHULTES 
NuMBER 8 (December 7, 1949) 
Nomenclatural Notes and New Concepts of Tropi- 
cal American Orchids 
By CHARLES SCHWEINFURTH . 
Noumse_er 4 (February 6, 1950) 
Studies in the Genus Hevea III 
By Ricuarp Evans ScHULTES 
The Identity of Ucuqui 
By JoAo Murca PirEs aND RicHarp Evans 
SCHULTES 
The Correct Name of the Yaupon 
By Ricuarp Evans SCHULTES 
A New Variety of [lex vomitoria from Southern 
Mexico 
By A. J. SHarp 
[ ix ] 
21 
49 
87 
97 
107 
