ACKNOWLEDGMENTS 



The present investigation has been supported, in part, by con- 

 tract MH-NOl DE -02425 with the National Institute of Dental 

 Research, National Institutes of Health, Bethesda, Maryland, 



U.S.A. 



We wish to thank Dr. William C. Burger, Chairman of the 



Botany Department, Field Museum of Natural History, Chi- 

 cago, for the kind permission in the use of the Stevia herbarium 

 collection for the present study. 



One of us, CMC, wants to thank the National Research 

 Council of Mexico (CONACYT) for financial support during 

 this study. 



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