202 PETROLOGY. 



of the Transylvanian Erzgebirge.] Min. Mitt. Heft 1, pp. 13- 

 30. 



Describes, in topographical order, a number of trachytic rocks from 

 the Ore-mountains of Transylvania. The rocks are chiefly hornblende- 

 andesites, of which two varieties are recognized — those containing quartz 

 (Dacite), and those without it. Several analyses of felspars from these 

 andesites are given. An augitic andesite is described from the Ju den- 

 berg. P. W. R. 



DoELTER, C. Porphyrit von Lienz. Min. Mitt. Heft 1, pp. 89-91. 

 [The title of this has been already printed at p. 57, from another 

 journal, but without notice.] 

 This rock forms a vein in mica-schist in the Isel valley, and is believed 

 to be not younger than the Eothliegende. A mineralogical description 

 of the rock is given. It consists of plagioclase, with a little orthoclase, 

 hornblende, and biotite. It may be classed with porphyrite ; or, if sepa- 

 rated as a distinct rock, may be called jpalceoandesite. F. W. it. 



Ueber einige Trachyte des Tokaj-Eperieser Gebirges. Min. 



Mitt. Heft 3, pp. 199-222. 

 A continuation of studies on trachytes, describing the rocks of the 

 mountains of Tokaj and Eperies. The following trachytic rocks occur 

 in this range : — Augite-andesite, augite-andesite lava, hornblende- ande- 

 site, quartziferous augite-andesite, rhy elite, quartziferous sanidiue- 

 trachyte, and sanidine-trachyte lava. Descriptions of microscopic 

 sections of these rocks and many chemical analyses are given. 



P. W. R. 

 Mikroscopische UntersTichung einiger Granite aus der tech- 



nischen Sammlung der k.-k. geologischen Reichsanstalt. [Micro- 

 scopic investigation of some granites in the collection of the 

 Imperial Geological Institute.] Yerh. k.-k. geol. Reichs. p. 147. 



Dtjkn, E. J. Diamond-bearing Rock of S. Africa. See Addenda. 



Egger, a. tT. Amphibolfels von Polling. Min. Mitt. Heft 3, p. 



243. 

 Analysis of a hornblende-rock from near Pelling, in Austria. 



EvERWiJN", R. Marmer op het eiland Amboina. Jaarb. Mijnw. 



Ned. O.-Ind. 3 Jaar., 1 Deel, pp. 172, 173. 

 Describes four specimens of marble from the island of Amboyna. 



PoRBHAM, H. G. Structure in Chalk. See p. 12. 



PouOTJi:, P. Etude microscopique et analyse mediate d'une ponce 

 du Yesuve. [Microscopic study and mean analysis of a Yesuvian 

 pumice.] Compt. Rend. t. Ixxix. pp. 8G9-872. 



Galletlt, John. Analysis of a Lepidodendroid Plant from the 

 Shale of West Calder ; with Remarks on the Pormation of Coal. 

 Trans. Edin. Geol. Soc. vol. ii. part 3, pp. 395-397. 



Contains an analysis Of the branch of a Lepidodendron. 



