Scientific Meeting in Germany. 283 



Quartz crystals, and partly, where effaced through subsequent dis- 

 solution and lixiviation, leaving their impression on these crystals 

 in the distinetest manner possible. 



Dr.Pichler, of Innsbruck, exhibited ageognosticmap of the north- 

 em limestone Alps of the Tyrol, from the borders of the Voralberg 

 to the borders of Saltzburg,and spoke at some length upon the differ- 

 ent formations. Dr. Von Dechen gave information with respect to 

 the geognostical map of Ehenish Westphalia, of which eleven sec- 

 tions had already appeared and nine others were in course of pre- 

 paration. Professor Plieninger spoke upon the difference in the 

 formation of the teeth between the microlestes antiquus, from the 

 upper breccia (betwixt the keuper and the lias) of "Wurtemberg, 

 and the Plagiaulax of the Purbeck oolite. Herr Von dem Borne 

 discoursed on the geology of Pomerania, referring to the alluvium, 

 the diluvium, the tertiary strata, and the Jura formations. The al- 

 luvium is found chiefly on the sandy coasts, greatly changed by cur- 

 rents. It is washed away from the Pomeranian and deposited on 

 the Prussian coast. In the diluvium he distinguished a disturbed 

 recent formation and a regularly deposited older one. 



On Monday 21st September, Professor Gustav Rose made some 

 observations on the gneiss which forms the north-western limit of 

 the granitite of the Riesengebirge, and of the granite which oc- 

 curs in it ; he also spoke of the relation of granite to gneiss in 

 general. The boundaries betwixt the two could, he said, be very 

 distinctly drawn in the Riesengebirge. In 1856 at Vienna the 

 learned Professor gave an account of some recent investigations 

 which he had made in the Riesengebirge and Isergebirge, with a 

 a view to determine the exact limits betwixt granitite and granite, 

 and assigned the reasons which had induced him to regard the 

 former as a separate species of rock from the latter. These reasons 

 were — first, the distinct mineral composition — the white mica of 

 the granite being entirely wanting; secondly, the accurate limits 

 which can be drawn betwixt it and the granite of the Isergebirge : 

 and, thirdly, the circumstance that mixtures of a similar composi- 

 tion to the granite of the Riesengebirge and Isergebirge occurred 

 in the most diverse localities. From the relations of the granitite 

 to the granite the Professor considered that the former must have 

 penetrated to the surface more recently than the latter. [See 

 also a contribution by Rose " Ueber die zur Granitgruppe gehorigen 

 Gebirgsarten" in the first volume of the " Zeitschrift der deutsch- 

 geologischen Gesellschaft."] 



