1867.] Mineralogy, Mining, and Metallurgy. 541 



more important of the papers it contains ; but several others are 

 worthy of perusal by those interested in the subjects treated of, 

 especially Mr. Boyd Dawkins's paper "On the Dentition of 

 Rhinoceros leptorhinus" 



It is with sincere grief that we are compelled to announce the 

 death of Mr. W. J. Hamilton, F.E.S., F.G.S., who was one of the 

 magnates of the Geological Society, having been twice its President, 

 and Secretary for a number of years. For an account of Mr. 

 Hamilton's career our limited space compels us to refer our readers 

 to the August number of the ' Geological Magazine.' 



8. MINEEALOGY, MINING, AND METALLUEGY. 



Mineralogy. 



The characteristic association of certain minerals or their para- 

 genesis — to use a convenient term adopted in German science — is a 

 subject deserving the most attentive consideration, whether for its 

 theoretical value, or for its practical bearing on mining enterprise. 

 It is, indeed, by the study of these associations, that we may hope 

 to become acqainted with the conditions under which the minerals 

 were formed ; and, by the accumulation of a sufficient number of 

 examples, may eventually be led to generalizations of great practical 

 utility. Even with our imperfect knowledge of the laws of para- 

 genesis, instances are not wanting of discoveries having been made 

 by observing that the presence of one species, perhaps in itself of 

 no value, points in many cases to the occurrence of another mineral 

 which may be of considerable importance. With regard to a sub- 

 stance so highly prized as gold, these observations have, of course, 

 especial interest ; and our thanks are, therefore, due to Herr 

 Credner for the painstaking way in which he has noted the 

 different associations of gold that have fallen under his observation 

 during a residence in the gold-fields of Georgia.* In many parts 

 of this State the gold is accompanied by tetradymite or telluric 

 bismuth, a mineral which is also found in our Welsh mines, and in 

 many other gold-bearing districts. South of Dahlonega the metal 

 occurs in a syenitic gneiss ; and to the east of the same locality, it 

 is found, with red garnets, in a chlorite-slate ; tetradymite being 

 an associate of the gold in both situations. The mode in which the 

 metal occurs in Cherokee County is of considerable paragenetic 

 interest : in the white talcose slate of that county there are found 

 numerous oval concretions of mispickel or arsenical pyrites. 



* Besclireibung einiger paragenetisch interessanter Gold-Vorkommen in 

 Georgia, Nord-Anierika. Leonhard und Geinitz's Neues Jahrbuck fur Mineralogie. 

 u.s.w. 1867, Heft IV., p. 442. 



