40 DR. WEDDELL'S RESEARCHES. Chap. II, 



by way of Arequipa to Cuzco. M. Delondre appears to have 

 employed a contractor to supply liim Avitli bark, who failed 

 in his engagements, and of whom the French quinine manu- 

 facturer bitterly complains as a second Dousterswivel.^ MM. 

 Weddell and Delondre finally left the chinchona forests in 

 September, 1847, and set out for the coast of Peru. Dr. 

 Weddell's valuable monograph on the chinchona genus, ' Mis- 

 toire naturelle des Quinquinas,' the most important work that 

 has yet appeared on the subject, was published at Paris in 1849. 



In 1851 Dr. Weddell undertook a second voyage to South 

 America, and in 1852 he entered the Bolivian chinchona 

 region of Tipuani by way of Sorata. In descending the 

 eastern slopes of the Andes he describes the vegetation as 

 taking new forms at every mile of the descent. The under- 

 growth was formed of Melastomacece with violet-coloured flowers 

 ( Ghcetogastra), myrtles, Qaultherias, and Andromedas ; lower 

 down there were many superb species of Thibaudias ; and, 

 where the great forests succeed to the smaller growth of the 

 more elevated region, the predominant trees were Escalloiiias, 

 arborescent Etipatorias, Bocconias, and a fruit-bearing Papilio- 

 nacea with a scarlet corolla. He encountered the first forest 

 chinchona-trees at an elevation of 7138 feet, being the C. ovata 

 var. a vulgaris. Descending still, he came to paccay-trees 

 {Mimosa Inga) in flower, and met with the first plant of the 

 shrubby variety of O. Calisaya, on an open grassy ridge or 

 pajonal, at an elevation of 4800 feet. 



Dr. Weddell descended the river Tipuani to Guanay, a 

 mission of Lecos Indians, and ascended the Coroico in a 

 canoe made of the wood of a species of Bomhax. The forests 

 bordering on the river Coroico abounded in many species of 

 palms, chiefly Maximilianas and Iriarteas, the latter a singular 

 kind with a trunk supported on long aerial roots. There were 



1 Quinologie, par M. A. Delondre. Paris, 1851. 



