336 THEORIES OF ORE DISPOSITION HISTORICALLY CONSIDERED. 



RESULTS ACIIIEVED. 



The wide divero^ence of \iews shown by these discussions to be held 

 by recognized authorities on the subject might lead one to conclude 

 that we are as far as ever from a universal agreement on accepted 

 theories. A more deliberate consideration of the progress of investi- 

 gation and verification during this last period, which has been but too 

 briefly and imperfectly set forth in the preceding pages, will show, 

 however, that the advance in this direction has been real and pernui- 

 nent as far as regards the later stages of ore foruiation. which are 

 more susceptible of actual proof, and that the disagreement lies rather 

 with the ultinuite or more theoretical sources of derivation, which 

 must always remain to some extent matters of opinion. 



BIBLIOGRAPHY. 



It being considered unadvisable to print a full list of works con- 

 sulted during the preparation of the preceding paper, titles of those 

 only that contain important bibliographies on ore deposition are 

 appended. 



A. G. Wei-ner : Neue Theorie voii der Entsteluing der Giinge. Fi'eiberg, 1701. 

 J. Walflanf v. Waldenstein : Die hesonderen Lagerstatten der nutzbaren Min- 



oralien. Wion, 1824. 

 K. A. Kiihn : Ilaiidbuch der (Jeogiiosie. 11'" band. Freiberg. ]S."'>»). 

 I*. V. (V)tta n. 11. Miiller : Gangstiidien, V band. Freil)erg. l.S.">0. 

 .robanu (Jriimii : Die Lagerstiitten der imtzbaren Miiieralien. Prag. IStJO. 

 Goiizalo y Tarin : Memorias de la comite del iiiapa geologico de Espafia. Madrid, 



1888. Tom. II, pp. 78-181. 

 K. Fucbs et L. De Launay : Traite des gites iiiineruux et metalliferes. I. I'aris, 



1893. 

 K. A. V. Zittell : History of Geology and Paleontology. Translation by Mrs. 



Ogilvie-Gordon. London. 10(11. 

 Richard Beck : Lehre you den Erzlagerstiitten. Berlin, 1!X)1. 2d ed., 190o. 



