PETEOLoar. 199 



Bohm. Bd. iii. Abth. 2, Heft 1, pp. 96, 2 chromolithographs. 



[jN'oticed in N. Jahrb. 1875, p. 320, and Amer. Journ. scr. 3, 



Tol. vii. p. 518.] 

 Describes the microscopic structure and chemical composition of the 

 Bohemian phonolites, and recognizes the eight following groups : — (A) 

 liejyheline-phonoUtes : 1. Nepheline-phonolite ; 2. Leucite-nepheline- 

 phonolite. (B) Nosean-pJionolites (Hauyne -phonolites) : 3. Nepheline- 

 nosean-phonolite ; 4. Leucite-nosean-phonolite ; 5. Sanidine-nosean- 

 phonolite. (C) Sanidine-phonolites i 6. Nepheline-sanidine-phonolites; 

 7. Oligoclase-sanidine-phonolite, or Trachyphonolite ; 8. Sanidiue- 

 phonolite. F. W. R. 



Bradley, T. H. On Unakyte, an epidotic rock from the Unaka 



range, on the borders of Tennessee and North Carolina. Amer. 



Journ. ser. 3, vol. vii. pp. 519, 520. 



The character relied upon for the separation of the species is the 



replacement of the inim of common granite, or the hornblende of syenite, 



by epidote. This rock is of Archaean age. G. A. L. 



CoRExwTN^DER, B. Tcucur cu magucsic de la dolomie de Hure. 

 [Amount of magnesia in the dolomite of Hure.] Ann. Soc. Geol. 

 Nord, 1870-74, pp. 17, 18. 

 An analysis of dolomite from Hure (Boulonnais) gives 30 per cent, 

 of carbonate of magnesia. 



. Analyse des dolomie de Hure, Saint-Remy-Chaussee, Pont- 



Sainte-Maxence, &c. [Analysis of dolomite from Hure, &c.] Ann. 



Soc. Geol. Nord, 1870-74, pp. 18, 19. 



The dolomites are from the Carboniferous Limestone and the Calcairo 



grossier of Flanders, and from the Magnesian Limestone of Durham. 



Four analyses are given. G. A. L. 



Presence de Tazote dans les parties calcaires de la tourbo 



d'Aveluy. [Presence of nitrogen in the calcareous portions of 

 the peat of Aveluy.] Ann. Soc. Ge'ol. Nord. 1870-74, p. 30. 

 'N'ote of analysis. The origin of the nitrogen is supposed to be the 

 decomposition of the plants of the peat. 



Analyse de la tourbo d'Aveluy. [Analysis of tho Aveluy 



peat.] Ann. Soc. Geol. Nord, 1870-74, p. 36. 

 Water 20-25, organic matter (combustible) 62*95, soluble salts 1'20, 

 insoluble salt 15*60 per cent. 



Credner, Georo 11. Die krystallinischer Gemcngtheilo gewisscr 

 Schieferthono und Thonc. [Crystalline constituents of certain 

 shales and clays.] Zcitsch. gesammt. Naturwiss. N. S. Bd. x. 

 pp. 1 9, with plate. 

 Zirkel has shown that Palaeozoic clay-slates contain crystalline con- 

 stituents. Tho author has extended these observations to slialcs and 

 clays from the following formations : — Carboniferous, Permian, Trias, 



