Intelligence and Miscellaneous Articles. 155 



acids; viz. the oxalic, acetic, formic, pyro- tartaric, pyrocitric, pyro- 

 mucic, succinic, benzoic, (Src, and by alcohol and sulphuric ether, 

 — Annales de Chimie et de Physique, tome xxxiv. p. 268. 



COMPOSITION OF NATIVE ARGENTIFEROUS GOLD. 

 M. Bousingault having had occasion to examine a great number 

 of samples of argentiferous gold found in Colombia, has observed 

 that these metals are united in definite proportions ; his process 

 consisted simply in dissolving the specimen in nitromuriatic acid, se- 

 parating the chlorideof silver, and then precipitating the gold in its 

 metallic state by protosulphate of iron. Mons. B. remarks that hi- 

 therto he has met with one atom of silver combined with 2, '7,5,6, and 

 8 atoms of gold ; but as he reckons the weight of an atom of silver 

 at double that which is usually admitted, these views will require 

 modifying ; and this we shall take the liberty of doing, in giving the 

 results of his analysis. 



Native gold of Marmato, near Vega de Sapin iit the province of 

 Popayan, sp.gr. 1 2*666. 

 Bv analysis. By theory. 



Gold ' 73-45 3 atoms gold '73-17 



Silver 26-48 2 atoms silver . . 26' S3 



Loss 00-07 



100-00 



100-00 



Native gold of Titiribi. 

 Bj' analysis. By theory. 



Gold 74 3 atoms gold .... 73-17 " 



Silver 26 2 atoms silver . . 26"83 



100 100-00 



Native gold of Malpaso, near Mariquita, sp. gr. 14706. 

 In analysing this and the remaining specimens, cupellation was 

 employed instead of aqua regia. 



By analysis. By theory. 



Gold 8s 24. 4 atoms gold 87-9 



Silver 1 176 1 atom silver .... 12-1 



100-00 1000 



Native gold of Rio Sucio, near Mariquita, 



By anal3'sis. By theory. 



Gold S7-94 4 atoms gold . . . I' 879 



Silver .... 1206 1 atom silver .... 12 1 



100-00 100 



Native gold of Olra-Mina, near Titiribi, — crystallized in octahedrons. 

 By analysis. Bv theory. 



Gold 73-4 3 atoms gold '73-17" 



Silver 26-6 2 atoms silver 26-83 



1000 10000 



X 2 Native 



