280 Reports and Proceedings — 



While affording such remarkable examples of the perfect transition 

 between the so-called plutonic and the volcanic classes of rocks, and of 

 the phenomena of contact metamorphism, the granitic masses of the 

 Schemnitz district are without question truly intrusive ; and a careful 

 study of them lends no support whatever to the hypothesis that 

 such rocks may be formed by the extreme metamorphism of sedi- 

 ments in situ. There is the most complete proof that in the 

 Schemnitz district the formation of true mineral veins, containing 

 gold, silver, and other metals, has taken place within the most 

 recent geological periods; in some cases, indeed, at a later date 

 than the Pliocene. 



The Geological Society of Stockholm. 

 (Geologiska Foreningen I Stockholm.) 



This Society, which has members also in Norway, Finland, and 

 Denmark, was founded at the end of the year 1871. It meets once 

 a month from ISTovember to May, and after each meeting is published 

 one number of the journal " Geologiska Foreningens i Stockholm 

 Forhandlingar " (Proceedings of the Geological Society of Stock- 

 holm), which has hitherto contained only original articles on 

 geology, paleontology, mineralogy, mining, etc. The journal is to 

 be had of Messrs. Samson and Wallin, Stockholm, at a cost of 5 

 Swedish crowns a year. 



The volume of the journal has increased year by year. For the 

 year 1875 it contained 354 pp. text, 15 tables, and several figures 

 in the text. 



Communications for the journal may be addressed to the Secretary 

 of the Society, Edvard Erdmann, Geologist of the Geological Survey 

 of Sweden, Stockholm. 



I.— Meeting, January 15, 1876.— C. F. Wsern, Esq., F.E. Swed. 

 Acad. Science, etc., in the Chair. 



Prof. G. Nordenstrom described the geological nature of the 

 Solstad copper- mine, in Southern Sweden, and exhibited some 

 sections and a model of the mine. 



Mr. 0. Gumelius made some observations on the glacial deposits 

 of Sweden. 



II.— Meeting, February 3, 1876.— C. F. Wern, etc., in the Chair. 



Dr. Th. Nordstrom, on the geology of the Falun copper-mine. 

 The ore is supposed to be the lower part of a very large, perpen- 

 dicular lens, whose upper end was denuded during the glacial period. 

 It is enclosed in quartzite, which rock is surrounded by mica-schist 

 and halleflinta. 



Prof. A. E. Nordenskiold exhibited and described some minerals 

 from the Ural, among which was a diamond-like mineral, demantoid, 

 which has the crystalline form of the garnet, and probably is nothing 

 but garnet. In Ural it is improperly named krysolite. 



Mr. A. E. Tornebohm read a paper by Mr. A. Sjogren : " On the 

 Mode of Occurrence of theTaberg Iron-ore, in the Province Smaland 

 in Sweden." Mr. Sjogren has proved, by means of microscopical 



