[64] Ruiz published his Quinologia in 1792.

[65] At first, in the best years, as many as 25,000 arrobas of bark were exported from the province of Huanuco, and some large fortunes were made.—Poeppig. An arroba = 25 lbs.

[66] Mercurio Peruano.

[67] A Peruvian who was for many years Director of the Cabinet of Natural History in Madrid, during the reign of Charles III.

[68] Reise in Peru, während der Jahre 1827-32, von Eduard Poeppig, Professor an der Universität zu Leipzig, ii. pp. 217-23, 257-64.

[69] Stevenson, however, says that large quantities of bark were brought from the woods east of Huamalies in 1825.—Travels, ii. p. 66.

[70] Poeppig. Van Tschudi, p. 399.

[71] Poeppig.

[72] Howard.

[73] I have caused the part of Poeppig's work which relates to chinchona-trees and their barks to be translated for circulation in India and Ceylon.