Leonhard and Geinitz's " JVeues Jahrhuchr 381 



geologists in particular, who are looking for distinctive characters 

 in the metamorphosed Laurentian and other old formations, Q. 

 Jensch offers some facts of interest in his paper on " Garnet, as an 

 essential component of the Gneiss and Gneissite of the Saxon 

 Erzgebirge" (p. 165, etc.). In the true '* gneiss " of those mountains 

 {" the older and normal grey gneiss " of Miiller), he finds dark mica, 

 albite (tetartine), oligoclase, and rutile {66 per cent, of silica) ; in 

 the " oligoclase-gneissite " (Miiller's "younger grey gneiss") he has 

 dark mica, oligoclase and rutile (65 per cent of silica) ; in the 

 *' tetartine-gneissite " (Miiller's " red gneiss ") he has clear mica and 

 albite (tetartine), (76 per cent, of silica) ; in the ** granulite," there 

 are clear mica and probably oligoclase (75 per cent, of silica). 

 F. Sandberyer, at p. 171, offers some remarks supplemental to his 

 paper on " Olivane-rock." B. Blum describes some curious drusic 

 concretions from the Bunter Sandstone, near Heidelberg, in which 

 the crystalloids have the form of Calcite crystals, bnt contain none 

 of that substance (pp. 320, etc.). E. Stohr describes, at large 

 (pp. 403, etc.), the nature, mode of occurrence, and distribution of 

 Kenngott's Pyropissite or Waxcoal, which is found in the Browncoal 

 Formation, near Weissenfels. H. Credner (pp. 442, etc.) gives an 

 account of some interesting paragenetic occurrences of gold in 

 Georgia: 1. With garnet and tetradymite in chlorite-schist; 2. With 

 tetradymite in hornblendic gneiss ; 3. (crystalline) with mispickel, 

 skorodite, and pharmacosiderite in talcschist ; 4. With iron 

 pyrites and limonite in quartz. H. Fleck (pp. 291, etc.) treats 

 of the chemical changes in the process of fossilization. At pp. 325, 

 etc., C. W. C. FucJis describes the volcanic phenomena and rocks of 

 Santorin. Schafhdutl supplies an additional essay on the rocks and 

 fossils of the Bavarian Alps (pp. 257, etc.), with three outlines of 

 of mountain-crests, and a plate of fossils. One of these ("Diplopora," 

 probably a little Dadylopora, as Eeuss has shown) was obtained 

 from a morsel of Muschelkalk (?) brought from the highest point of 

 the Zugspitze. Fr. A. Fallou's paper on the " Loess of Saxony " 

 (pp. 143, etc.) is of much interest. A. Stelzner's translation of F. 

 Johnstrup's valuable memoir on the formation and subsequent modi- 

 fications of the Chalk of Faxoe (pp. 543, etc.) supplies German 

 readers with information, not long since published in Denmark, 

 about the Northern Chalk, which English readers also should 

 have at command. The stratification of the Brown and the Black 

 Jura in the Klettgau, between the Ehine and the Wutach, is given 

 in detail at pp. 39, etc., by L. Wilrttenherger ; and the age of the 

 limestone of the " Porte-de-France," near Grenoble, is discussed by 

 F. W. Benecke at pp. 60, etc., the upper limestone being referred by 

 him to Oppel's " Tithonic " zone, and the lower to the Kimmeridgian. 

 Permian rocks, ores, and fossils receive attention from Streng 

 (p. 513), G. Wurttenherger (p. 10), Geinitz (p. 288), and Schmidt 

 (p. 576) ; and Geinitz also gives an account of the Carboniferous 

 Flora of Portugal, as described by jB. A. Gomes (pp. 273, etc.) ; and 

 he figures and describes his Trybliocrinus Flatheanus from the Car- 

 boniferous rocks of the Asturias; his Dictyophyton lAebeanum (?) 



