338 HISTORY OF MINERALOGY. 



these characters as the Wernerian method required, without finding 

 that they were more distinctive than might at first sight be imagined ; 

 and the analogy which this mode of studying Mineralogy established 

 between that and other branches of Natural History, recommended the 

 method to those in whom a general inclination to such studies was 

 excited. Thus Professor Jameson of Edinburgh, who had been one 

 of the pupils of Werner at Freiberg, not only published works in 

 which he promulgated the mineralogical doctrines of his master, but 

 established in Edinburgh a "Wernerian Society," having for its object 

 the general cultivation of Natural History. 



Werner's standards and nomenclature of external characters were 

 somewhat modified by Mohs, who, with the same kinds of talents and 

 views, succeeded him at Freiberg. Mohs reduced hardness to numeri- 

 cal measure by selecting ten known minerals, each harder than the 

 other in order, from talc to corundum and diamond, and by making 

 the place which these minerals occupy in the list, the numerical mea- 

 sure of the hardness of those which are compared with them. The 

 result of the application of this fixed measurement and nomenclature 

 of external characters will appear in the History of Classification, to 

 which we now proceed. 



