PETEOLOeT. 209 



Cronquist, A. W. Ytterligare meddelande oni leror och ofrig eldfast 

 material fran Stabbarps stenkolsgrufva i Sklne. [The clays and 

 other non-combustible matter from the Stabbarps Coal-mine in 

 Scania.] Geol.foren. Stockholm, Fork. Bd. ii. no. 28, pp. 558-564. 



A number of analyses are given. 



Dana, Prof. J. D. Porphyry of the Island of Lambay, a few miles 

 north of Dublin Bay. Ame7\ Jouni. ser. 3, vol. ix. pp. 58, 59. 



Note on the views of Prof. Hull (see Geological Record for 187-1, 

 p. 205). The writer thinks that the chlorite in this porphyry, which 

 is regarded by Prof. Hull as introduced as a secondary product by the 

 agency of water, " was made through the agency of water that gained 

 admission from some subterranean bource when the melted rock was 

 ascending to the surface.^' To the same cause are due the cavities of 

 amygdaloidal rocks, and a large part of the zeolitic and other minerals 

 with which they are filled. G. A. L. 



. Notice of the Chemical and Geological Essays of T. S. Hunt. 



Amer. Journ. ser. 3, vol. ix. pp. 102-109. 



Chiefly a denial of the views attributed to him by Prof. Hunt. The 

 writer has never held : — 1, the possibility of converting almost any 

 silicate into any other ; 2, 3, 4, the possibility of converting granite, 

 gneiss, or diorite into limestone ; 5, 6, 7, 8, the possibility of convert- 

 ing granite, granulite, gneiss, or diorite into serpentine ; 9, 10, the 

 possibility of converting limestone into granite or gneiss. G. A. L. 



. Pseudomorphism and Metamorphism : a correction. Amer. 



Journ. ser. 3, vol. x. pp. 298-300. 

 Shows that the writer " never held that metamorphism is pseudo- 

 morphism on a large scale," except in special cases. 



Delesse, Prof. A. Remarques sur le Granite et sur les Roches meta- 

 morphiques. [Remarks on Granite and on Metamorphic Rocks.] 

 Bull. Soc. Geol. France, 3 ser. t. iii. pp. 154-159. 



Criticises the theories of A. Knop and Von Lasaulx as to the formation 

 of granite, gneiss, and crystalline schists. Thinks that the microscopical 

 analysis of rocks, though most useful in throwing light on their 

 intimate structure, has given rise to much fallacious geological reasoning, 

 and quotes with approval De Saussure's saying that " mountains must 

 not be studied with a microscope." G. A. L. 



Doelter, Dr. C. Trachyte von der Insel Kos. [Trachyte of the 

 Island of Cos.] Vtrh. k.-h. geol. Reichs. pp. 233, 234. 



Specimens given for microscopical examination proved to be : — 1, 

 Rhyolite; 2, Augitic Andesite ; 3, Trachyte. 



. [Rocks of Tyrol.] N. Jahrh. Heft i. pp. 46-49. 



Letter announcing results of survey- work among the eruptive 

 rocks of Fassa and Pleims. Concludes that all the eruptive rocks are 

 of the same ago, namely that of the augitic poriihyry of the Seisser 

 Alp, which may be referred to the period of the Wengen beds. No 

 younger rocks have been observed. The syenite is the oldest of the 



1875. p 



