46 Canadian Record of Science. 



borne out by the studies which have been made of the gran- 

 itic and syenitic rocks of the Christiania district. The true 

 granular, the aplitic, the granophyric, as well as the peg- 

 matitic apophyses, those, for example, of the boundary of 

 the granitiie-laccolite in Hortekollen, which run into the 

 overlying Silurian limestones and schists from the under- 

 lying granitic rocks, indicate by their peculiarities a very 

 fluid condition of the magma ; even the narrowest veins and 

 strings in the metamorphic schists are filled, even to their 

 microscopically minute branches, with genuine granitic 

 aplite or granophyre. Younger veins are represented by 

 small quartz strings. That these last, the quartz veins, 

 should be considered as "secretions," or, to use Beyer's 

 expression, " exudations' of the solidifying granitic mass, 1 

 is most probable. The pegmatite veins themselves, however, 

 according to my opinion, are in general not to be considered 

 as secretion veins (Beyer, 1. c, the same) etc., but as genuine 

 magmatic eruptive veins formed under peculiar conditions. 

 {To be continued?) 



The Cambrian Terrain at Tejrovic, Bohemia. 



By G. *. Matthew, F.R.S.C. 



The geological student will find matter of interest in the 

 pamphlet published by Dr. J. J. Jahn of Vienna, on the 

 Cambrian beds of the above locality. 2 In Bohemia the 

 illustrious Barrande discovered what was once thought to be 

 the oldest Palaeozoic Fauna (which he named "Primordial") 

 and hence the region must ever remain classic ground to 

 the geologist. 



The interest in Dr. Jahn's pamphlet centres in the fact 

 that he has carefully gone over the Cambrian section at, 

 Tejrovic, fixed there the stratigraphical place of Barrande's 

 Primordial Fauna, and shown the existence of the Primor- 

 dial genera both above and below the typical horizon. 



The foundation of the Cambrian terrain at Tejrovic is the 



1 See " Theoretische Geologie," Stuttgart, 1888, p. 101. 



2 Verh. der k. k. geologischen Reichsanstalt, Wien, 1893. 



