LITERATURE. 
The following is a list of the more valuable of the recent works 
bearing upon the geology and mineral resources of Colombia, together 
with some of the more useful older works. The value of many of 
these has been judged. necessarily only by the title, for I have not 
been able to consult all. Those which I have been able to consult 
are marked with an asterisk. References to the bibliographies of the 
region are included in the list: 
Ueber den Salzquellen des Nérdlichen Theilesper Provinz Antio- 
quia und die Gebirgsformation der Umgebung von Medellin im Frei-. 
staate von Neu Granada. Karsten. Archiv f Min. XII, 1839. 
Pamplona, Colombia. Carl Degenhardt. Wonatsberichte tiber 
die Verhandlungen der Gesellschaft fiir Erdkunde zu Berlin, 1842. This 
contains a map of the Baja District of Pamplona. | 
*Metallic Wealth of the United States. J. D. Whitney. Phila- 
delphia, 1854, pp. 109, TQ}. 
*Die Geologische Uebersichts Karte des mittlerern Theiles von 
Siid America. F. Fotterle.. 4 map from Petermanns Mitt, (?). Vol. 
LT, 7856. Thecolors have faded, and not much can be made out 
irom iby 
*Metalliferous Minerals and Mining. Davies, p. 284. This 
refers to the mercurial deposits. 
Die Geognostichen Verhaltnisse in Neu Granada. Herman Kars- 
ten. Verhandlungen der Versammlung deutscher Naturforscher, Wien, 
7856. 
M. Pissis. Ann. des Mines, 5 m. Ser. Vol, 1X, 1856, p. 84. 
David Forbes. Quart. Jour. Geol. Soc., Vol. XVII, p. 7. 
*Carta Corographica del Estado del Cauca, por Manuel Ponce de 
Léon. Bogotd, 1864. 
*On the Existence of Gold-bearing Eruptive Rocks in South 
America, which have made their appearance at two very distant 
Geological periods. David Forbes. ep’t Br. Ass’n Adv. Sct., 1865, 
Pp 52. 
*Notes on the Geology and Mining of the United States of 
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