Vlll 



PEEFACE. 



Don Ramon Paez, of Veneznela, for valuable assistance 

 rendered us in the preparation of our Avork ; to Seiior 

 E. Staal, of Valencia, for mncli information kindly 

 given us; to Mr. James Henderson, of Para, J, F. 

 Keeve, Esq., of Guayaquil, and Dr. William Jameson, 

 of Quito, for many favors. We Avould also express 

 our deep obligations to Prof. A. Hopkins, for valuable 

 snggestions and kind encouragement in our work; to 

 Dr. J. Torrey, for the examination of plants submitted 

 to him ; to R. II. Forbes, our fellow-traveller, for notes 

 generously placed at our disposal ; to Albert Bushnell, 

 also our friend and companion ; to C. P. Williams, Esq., 

 of Albany ; to W. P. Palmer, Esq., and Cjanis W. Field, 

 Esq., of Kew York ; and to R. B. Hall, Esq., of Ash- 

 field, Mass, Nor would we forget to acknowledge our 

 indebtedness to Captain Lee, of Guayaquil, to Captain 

 Raygado, of the Peruvian steamer " Morona," to Com- 

 mandante Cardozo, of the Brazilian steamer " Icami- 

 aba," on the Amazons, and to the many other Mends 

 that have aided ns, and wliose favors are gratefully re- 

 membered. 



The Authoes. 

 Williams Collegf, Kovemher, ISTO. 



