PETROLOGY. 207 



Baltzer, A. Geognostisch-chcmische Mittheilungen Uber die neuesten 

 Eruptionen auf Vulcano und die Producte derselben. [Geologi co- 

 chemical ;N'otes on the latest Eruptions of Yulcano.] Zeitsch. 

 deutsch, geol. Ges. Ed. xxvi. Heft 1, pp. 36-62, with 3 plates. 

 Yulcano was active from Aug. 1873 to Dec. 1874, with a period of 

 comparative repose from Feb. to July 1874. The ejecta consisted chiefly 

 of ashes and sand : there was no lava. Two kinds of ashes were 

 recognized, a normal grey ash and a peculiar snow-white ash. The 

 latter is highly siliceous, the siHca existing chiefly as tridymite. The 

 recent products are rich in silica, whilst according to earlier authorities 

 lava poor in silica was formerly ejected. F. W. R. 



Barachon, — . [Analysis of argillaceous Sandstone associated with 

 the Fire-clay of Fumel.] Mev. Geol. t. xii. pp. 57, 58. 



. [Analyses of Fire-clay from Fumel and Cuzom.] Mev. Geol. 



t. xii. pp. 59, 60. 



Barral, J. A. [Analysis of Pond-mud from Bourg (Loiret).] Bull. 

 Soc. centr. Agric. France, 3 ser. t. ix. p. 839, and Eev. Geol. t. xii. 

 pp. o8, 59. 



Bane, — . [Bauxite in Austria.] Itev. Geol. t. xi. p. 75. 

 Note of occurrence at Dreistetten near Semmering, and at Wochem 

 in Carniola. Analyses of bauxite from both localities given. 



Beghin, — , and Ch. Mene. Analyse du charbon mineral de Tile de 

 Suderoe. [Analysis of the Suderoe Coal.] Compt. Rend. t. Ixxx. 

 pp. 1404, 1405. 



This lignite is enclosed among doleritic rocks. From its composition 

 the authors conclude it to be Tertiary. 



Blake, James. On the Structure of the Sonorous Sand from Kauai. 



Proc. Calif. Ac. Sci. vol. v. pt. iii. pp. 357, 358. See also letter 



by W. R. 'Frink, pp. 338-340. 

 The grains were chiefly parts of corals, etc., all more or less per- 

 forated : hence the sound when they are in motion. 



Bof icky, Dr. E. [Bohemian Basalts.] iV. Jahrb. Heft iii. pp. 288- 

 200. 



Letter referring to Prof. Mohl's Catalogue of typical basalts [see 

 Geological Record for 1874, p. 211], claiming priority for recognizing 

 the " magma-basalts," and correcting some errors, such as the assertion 

 that phonolite-basalts occur as dykes in phonolite. F. \V. R. 



Browning, A. The probable Influence of Railway Construction in 



Natal, &c. Jour a. Soc. Arts, vol. xxiii. no. 1169, p. 475. 

 Gives an analysis of Dundee coal at p. 476. 



Campbell-Brown, Dr. J. On the agricultural chemistry of the Tea 



Plantations of India. Journ. Chem. Soc. pp. 1217-1228. 

 Contains 6 analyses of soils of Indian Tea Plantations (pp. 1222, 

 1223). 



