Wernerian Natural History Society. 187 



Royal Irish Academy ; and Professor Werner, of Freyberg, 

 were elected the first hoaorary members. The following fo- 

 reign members have been elected : — viz. Professor Karsten, 

 Berlin; Professor Klaproth, Berlin; M. Von Humboldt, 

 and M. Von Buch, also of Berlin. M. F. Mohs, of Stiria; 

 M. Herden, M. Meuden, and M. Friesleben, of Saxony. 



At the last meeting of the Wcrnerian 'Natural History 

 Society, Protessor Jameson read a description of cotempo- 

 r.aneous or inclosed veins. He divided veins into two clas- 

 ses. The first class comprehend triie veins, the second cO' 

 temporaneous or inclosed veins. Some veins, he remarked, 

 excepting where the beds and strata are of very great thick- 

 ness, traverse many different strata or beds; and although 

 we do not always observe them open at the surface of the 

 earth, they invariably open at the surface of the formation 

 or series of formations they traverse : thus, the outgoing or 

 opening of certain metalliferous veins that traverse clay-slate 

 and mica-slate is sometimes covered by the second porphyry 

 formation. Cotemporaneous or inclosed veins are in general 

 iCopfine4 to individual beds or strata, and are fairly inclosed 

 in them, or in other words wedge out in every direction \i\ 

 the bed or stratum ii) which they are contained. 



After detailing thp various characters of true and cotem- 

 poraneous veins, ,the Professor next described the cotcm- 

 porapepus veins that occur in the different great rock- for- 

 mations, beginning with granite, and ending with the new- 

 est flaetz trap formation. He next explained the mode of 

 formation of these veins^ When describing the cotempo- 

 raneous veins that occur in gneiss, he remarked that cer- 

 tain varieties of yenigenous gneiss bear a striking resem- 

 blance to granite, and hence have been frequently confound- 

 ed with that rock. This led him to point out the cha- 

 racters by which true granite veins are distinguished from 

 veins of granitic gneiss. As connected with this part of the 

 subject, he examined the facts on which theHuttonian theorv 

 of granite is founded; and proved by h detail of his examina- 

 ' ^ion of the appearances described by Dr. Hutton, Professor 

 play fair and others, that the supposed granite veins shooting 



fro«) 



