Virola surinamensis (Rol.) Warburg in Nova Acta Acad. Leop.-Carol. 68 
(1897)208. 
Virola theiodora (Spr. ex Bth.) Warburg in Nova Acta Acad. Leop.-Carol. 
68(1897)187. 
Virola venosa (Bth.) Warburg in Nova Acta Acad. Leop.-Carol. 68(1897)224. 
ACKNOWLEDGMENTS 
The Alpha Helix Expedition Phase C (1967) and Phase VII 
(1977) were financed by the National Science Foundation. 
Support was also obtained from the Swedish Medical Research 
Council, the National Institutes of Health and the Atkins Fund of 
Harvard University. 
We would like to express our gratitude to Dr. Ghillean Prance 
of the New York Botanical Garden for his assistance in collecting 
vouchered material for chemical analysis. 
Dr. William A. Rodrigues of the Instituto Nacional de 
Pesquisas da Amaz6nia in Manaos was most cooperative in 
assisting in the determination of the voucher specimens. The 
major part of the botanical material was determined by Professor 
Schultes and Dr. Plowman at the Botanical Museum of Harvard 
University. 
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