Chap. II. DR. WEDDELL'S RESEARCHES. 39 



nan, which was sent out by Louis Philippe to South America, 

 and, after crossmg the vast empire of Brazil, entered Bolivia 

 by the country of the Chiquitos in August, 1845. It was 

 Dr. Weddell's chief object to examine the chinchona region of 

 this country, and his first step was to proceed to Tarija, 

 to ascertain the extreme southern limit of the chinchona- 

 trees, which he discovered in 19° S. lat. He named the 

 species C. Australis. Dr. Weddell then commenced a 

 thorough exploration of the Bolivian chinchona forests, 

 making his way over the most difficult country, from Cocha- 

 bamba, through Ayopaya, Enquisivi, and the yimgus ^ of La 

 Paz ; where the species of chinchonfe continued to multiply 

 under his eye. In Enquisivi he first met vrith and studied 

 the (7. Calisaya, which he named and described, collecting 

 much information respecting the trade, and the methods 

 of collecting bark. In 1847 he entered the province of 

 Capaulican, descending the river Tipuani, where he was 

 attacked by fever, and ascending the Mapiri. At Apollo- 

 bamba, the centre of the most ancient bark-collecting dis- 

 trict, he found that the siu'rounding forests were quite cleared 

 of chinchona-trees, and that it was necessary to seek for them 

 at a distance of ten or twelve days' journey from any inha- 

 bited place. In June 1847 Dr. Weddell entered the Peruvian 

 province of Caravaya, examined the chinchona forests of the 

 valleys of Sandia (San Juan del Oro) and Tambopata, and 

 concluded his investigations by a visit to the lovely ravine of 

 Santa Anna, near Cuzco. 



Dr. Weddell was accompanied in his visit to the valleys of 

 Santa Anna by M. Delondi-e, a manufacturer of quinine at 

 Havre, who, after contemplating the project of paying a per- 

 sonal visit to the chinchona forests for twenty years, had at 

 length set out, landed at Islay in July, 1847, and proceeded 



9 YuitcH is a tropical valley in Quichua, hence yungus, a Spiinish corruptiou 

 iif the same wt>rd. 



