Number 5 (March 20, 1950) 
Plantae Austro-Americanae VI 
By Ricuarp Evans SCHULTES 
Numser 6 (November 6, 1950) 
Notes on Peruvian Cinchonas I 
By W. H. Hopce 
Number 7 (December 11, 1950) 
Prehistoric Plant Remains from Bat Cave 
By C. E. Smita, Jr. 
NuMBER 8 (January 15, 1951) 
The Story of Pan Chewing in India 
By M. Gowpa 
NuMBER 9 (March 138, 1951) 
New Orchids from Africa 
By V.S. SUuMMERHAYES . 
A Revision of the Genus Angraecopsis 
By V. S. SUMMERHAYES 
NuMBER 10 (April 18, 1951) 
Whence Came Maize to Asia? 
By Paut C. MANGELSDORF AND Doucutas L. 
OLIVER 
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