On Jamesonite. 293 



Antimony-glance, afterwards by Haidinger under its present 

 name, which is that adopted by mineralogists. The following 

 three analyses of it were made by Henry Rose : 



I. 



Sulphur, . .. 22.15 



Antimony, . . 34.40 



Lead, 40-75 



Lead, with slight trace 1 

 of Iron and Zinc, J "■ 



Copper, 0.13 



Iron, 2.30 



99.T3 99.72 



The proportion of sulphur taken up by the antimony and lead 

 is as 12.87 to 6.33, also as 2 to 1. The overplus of sulphur is 

 sufficient to form with the iron iron-pyrites. Although the mi- 

 neral appears to be pure, yet we cannot admit that the quantity 

 of iron-pyrites is an essential ingredient of its composition. The 

 essential composition of Jamesonite may be expressed by the 

 following formula, 2Sb + 3Ph. 



On the relative Age of the different European Chains of Moun- 

 tains. 



v/iCERO remarks, that he did not conceive how two augurs 

 could look upon each other without laughing. Not many years 

 ago, the saying might have been applied to geologists, without 

 their having much reason to complain ; for the science which 

 they professed was then a mere collection of absurd hypothe- 

 ses, not rendered necessary by any accurate observation. Now, 

 however, the case is different, and geology occupies a place 

 among the i-cienccs. The number of particular investigations of 

 which it is composed is immense, the facts collected are as nu- 

 merous as accurately observed, and some of the general results 

 that have been deduced from them deserve the greatest at- 

 tention ; for tliey throw light upon the original state of the 

 globe, and upon the frightful physical revolutions which it has 



1 



