xiii 



found ourselves obliged to throw away 

 others, which we had collected a consider- 

 able time before. These sacrifices were not 

 less painful than the losses which we acci- 

 dentally made. Sad experience taught us 

 but too late, that from the sultry humidity 

 of the climate, and the frequent falls of the 

 beasts of burden, we could preserve nei- 



199) ; the obsidians of the Knife mountain of Moran, 

 and the pierre perlee, perlstein of Cinapecuaro ( Des- 

 cotils, Annates de Chimie, Lhll, 260) ; concrete oxi- 

 dated tin, (wood tin) of Mexico ( Descotils, Ann* 

 LIU, 266) ; the brown lead-ore of Zimapan ( Desco- 

 tils, Ann. LIU, 268) ; the celestine of Popayan and 

 the wavellite, or hydrargillite ; a pepite of platina 

 of Choco, weighing 1088*8 grains, which is 18 947 

 specific gravity ( Karsten, 96) ; the moya of Pelileo, 

 a volcanic combustible substance, containing felds. 

 path ( Klap. IV, £89) ; the guano of the islands of 

 Peru, containing urat of ammonia ( Klapr. IV, 

 299. Fourcroy et Vauquelin, Mem. of the Inst. VI, 

 369) ; the dapiche of the river Temi, a species of white 

 caoutchouc, which is found at the depth of three or 

 four feet in a damp soil ( Allen, Journ. Phys. Liv. XV IL 

 77); the tabasheer of the bamboos of America, dif 

 ferent from that of Asia ( Vauquelin, Mem. de VInstit. 

 VI, 382) ; the cortex Angusturae, bark of the bonplan- 

 dia trifoliata of Carony ; the cinchona condaminea of 

 Loxa, and several other species of cinchina, which 

 we collected in the forests of New Grenada (Vau- 

 quelin, Ann. LIX, 137). 



