XXXV 



by Mr. Bon plan d, on the plants which 

 have hitherto been imperfectly described. 

 The plates of this work will be engraved 

 and executed according to the method fol- 

 lowed by Mr. Labillardiere, in the Sped- 

 men Plantarum Novce Hollandice, which is a 

 model of sagacity in research, and order in 

 compilation. 



The astronomical, geodesical, and baro- 

 metric observations, have been calculated 

 in a uniform manner, by employing corre- 

 spondent observations, and according to 

 tables of the utmost precision, by Mr. Olt- 

 manns, professor of astronomy, and mem- 

 ber of the academy of Berlin ; who under- 

 took the publication of my astronomical 

 journal, which he has enriched with the 

 results of his inquiries concerning the geo- 

 graphy of America, the observations of 

 Spanish, French, and English travellers, 

 and the choice of the methods used by as- 

 tronomers. I had calculated, during the 

 course of my journey, two-thirds of my own 

 observations, a part of the results of which 



beautiful monography of this genus, published by 

 Mr. de la Roche. 



d 2 



