218 PETROLOGY. 



Neminar, Edmund F. XJeber die Entstehimgsweise der Zellen- 

 kalke und verwandtor (jcbilde. [Origin of cellular Limestones, 

 &c.] Min. Mitt. Heft iv. pp. 251-282 ; 3 woodcuts. 



Concludes that cellular limestones are secondary formations pro- 

 duced by the action of meteoric waters on limestone, and are not 

 characteristic of any geological formation. Two groups are recognized 

 — limestones with even-faced crystalline walls to the cavities, and 

 those with quite irregular hollows. The powdery matter sometimes 

 found in the cells may be normal dolomite or marl, according to the 

 composition of the original limestone. A cellular limestone is never 

 reconverted into a compact rock by further action of water. P. W. K,. 



Newton, E. T. On Tasmanite and Australian White Coal. Geol. 

 Mag. dec. ii. vol. ii. p. 336-342 ; plate 10. 



Gives analyses and discusses the origin of these coals. Concludes 

 that the first and probably the second also are true coals in process of 

 formation, though of inferior quality. T. G. B. 



Niedzwiedzki, Julian. Ueber Gesteine von der Insel Samothrake. 

 [Rocks of Samothrace.] Min. Mitt. Heft ii. pp. 89-108. 



Herr Homes, who accompanied the archaeological expedition to 

 Samothrace in 1873, described the geology of the island (see 

 Geological Record for 1874, p. 73), and handed his rock-specimens 

 for microscopic study to the writer, whose essay forms a supplement to 

 Hornes's memoir. The rocks described are granite, quartz-trachytes, 

 biotite-trachyte, basalt, and gabbro. F. W. R. 



Pettersen, K. De gneis-granitiske dannelser langs det nordlige 



Norges kyststrog. [The Gneiss-granite on the N. Coast of 

 Norway.] Geol. foren. Stoclcholm Fork. Bd. ii. pp. 450-468 ; 

 plate. 



Pichler, Prof. Adolf. Beitrage zur Geognosie Tirols. [Geology of 

 the Tyrol.] N. Jahrh. Heft ix. pp. 926-936. 



Proposes to distinguish several Tyrolese rocks by local names. 

 Tollite, a dioritic porphyry from the Toll, near Meran ; Vintlite, a 

 quartz -hornblende porphyrite from Yintl ; and EhrwcilcUte., a Jurassic 

 augite-porphyry from Ehrwald. [For rest, see Geology, p. 91.] F.W.R. 



Piquet, A. Argile en filons. [Clay in veins.] Rev. Geol. t. xi. 

 pp. 50, 51. 



Gives analysis of white clay from Pancorvo, Province of Burgos, 

 which forms a kind of vein running partly with and partly across the 

 strike of the Cretaceous limestones of the district. Red hematite and 

 spathose iron are associated with it. G. A. L. 



Plant, F. On the Origin of some Arenaceous Nodules in Coal 

 measure Sandstone. Trans. Manch, Geol. Soc. vol. xiii. part. x. 

 pp. 338-340. 



The surfaces of small nodules in sandstones are covered with ridges. 



