PETROLOGY. 213 



ScnEimEK-KEST^ER, Aug., and Cn. Mextnier-Dolftis. Etudes sur 

 trois combustibles du Bassin du Donctz et sur un lignite de Tenia 

 (Russie). [Three combustible minerals of the Donetz, and lignite 

 of Tenia, Russia.] Ann. Chim. Phys. ser. 5, t. ii. pp. 325-332. 



ScHLOEsiNG, Th. Sur la constitution des Argiles. [Composition of 



clays.] Compt. Rend. t. Ixxviii. pp. 1438-1442, and t. Ixxix. 



pp. 376-380, 473. 



Describes experimental methods of distinguishing between clays 



which are crystalline in structure and amorphous or colloid clays. 



The second note chiefly consists of an explanation of the author's 



application of his mode of clay-analysis to kaolins. A number of 



analyses are given. G. A. L. 



Schmidt, Dr. C. Die * Mineralbutter ' der IJferfelsen der Irtisch und 

 tTenissei. [Mineral butter from'Siberia.] Mel. Phys. Chim. t. ix. 

 pp. 5-9. [BuU. t. xix. pp. 63-66.] 

 Gives analyses of " stone -butter " from the Jenissei and of "moun- 

 tain-butter" from the Irtisch. Both contain basic sulphates of alumina 

 and peroxide of iron, with sulphates of magnesia, lime, potash, and 

 soda ; but that from the Jenissei contains also sulphate of ammonia, and 

 is richer in sulphate of magnesia than the other. P. "W. R. 



Senft, Dr. Analytische Tabellen zur Bestimmung der Classen, 

 Ordnungcn, Gruppen, Sippen und Arten der Mineralien und Ge- 

 birgsarten. Hanover. Pp. 102. 



The second part contains tables for the determination of species of 

 rocks. 



Stolba, F. [Dolomitic Sandstones from the Silurian Pormations.] 

 Chem. Centr. p. 134. [Noticed in Journ. Chem. Sec. ser. 2, vol. 

 xii. p. 967.] 



Contains analyses of these rocks. 



SxoLPE, M. Posfosyrehaltig bergart i SkSne. [Rock containing 

 phosphoric acid in Scania.] Geol. foren. Stockholm Porhandl. 

 bdt. i. p. 235. 



Note of occurrence. 



Stur, D. Phosphorsiiurchaltige Gesteine in eincm Bohrloche bei 

 Schonau in Bohmen. [Rocks containing phosphoric acid in a 

 borihg near Schonau, in Bohemia.] Verb. k.-k. geol. Reichs. 

 pp. 399, 400. * ; 



Taylor, Andrew. Chemical notes of Analyses of various Coals and 

 Peat-fuels. Trans. Edin. Geol. Soc. vol. ii. part 3, pp. 371-373. 



T. [TscHERMAK ?]. Stalagmit aus der Adclsberger Grottc. Min. 

 Mitt. Heft 2, pp. 179, 180. 



Describes a group of stalagmites from the Erzherzog-Johann grotto 

 at Adelsberg, exhibited at the Vienna Exhibition, and afterwards^pre- 

 scnted to the Imperial Museum. l'\ AV. R 



