316 A. LIVERSIDGE. 
no soil is without the nitrogenous materials necessary to set the 
chlorine free, and therefore capable of attacking the gold and 
rendering it soluble.” . . . . ‘‘The readiness of filtration through 
the relatively easily permeated gravel causes the gold to precipitate 
so rapidly that there is no time for any but a mammillary deposit, 
which in vein deposits the extreme slowness of the deposition 
allows the gold to assume the crystalline shape.” 
Melville Attwood, E.M., in a paper—On the Source or Origin of 
Gold found in Lodes, Veins, or Deposits (Report of the State 
Mineralogist of California, 1884, Vol. vir1., p. 773) quotes that 
‘M. Laur (On the Origin and Distribution of Gold in California, 
communicated to the Academy of Sciences, Paris) mentions having 
found metallic gold in deposits, evidently derived from some hot 
springs.” 
M. A. Daubrée, in his Les eaux souterraines a Pepoque actualle 
(Paris, 1887, p. 33) says :—‘“ Plusieurs géologiques (MM. J. P. 
Laur, A. Phillips, et Egleston) ou cru reconnaitre qu’en Californie 
de Vor se dépose encore actuellement, particulierement dans des 
graviers. On prétend aussi avoir trouvé ce metal dans l’eau de 
Loueche et plus récemment, d’apres Gotll, dans eau de Gieshiibl 
et dans celle de Carlsbad.” 
Posepny Zur Genesis der Metallseifen (Cisterr. Zeits. f. Berg. 
und Huttenwesen. 1887, xxxv.) is of opinion that the formation 
of large masses of gold in the vein are more easily accounted for 
than in alluvial deposits. 
EK. Cohen—On the Genesis of Alluvial Gold (Jahr. f. Min., 1889, 
i, Ref. 439-440 from Mit. Ver. f. Neuvorpommern u. Riigen, 19, 
198) is of opinion that the greater part of alluvial gold is derived 
by the disintegration of older deposits, but that separation from 
solution also occurs in a subordinate manner. | 
Mr. H. P. Washburn in a paper entitled—A Theory on the 
formation of Gold into Specks and Nuggets (Trans. N.Z. Inst., 
1889, p. 400) opposes the hypothesis that nuggets have been 
formed tn situ in alluvial deposits. 
