CHARLES R. CLEMENT,¹ Roland C. Clement<sup>2

1</sup>Charles R. Clement (e-mail: ) works at the Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Ciências Agronômicas, 69060-001 Manaus, Amazonas, Brazil cclement@inpa.gov.br
²Roland C. Clement (e-mail: ) was vice-president for research at the National Audubon Society in the 1970s and is now a research fellow in Yale's Agrarian Studies Program, New Haven, Connecticut Rcc112212@aol.com