244 MINERALOGY. 



Contains analyses of the gases enclosed in Wigan cannel, Scotch 

 cannels, and Whitby jet. The cannels differ from the bituminous, 

 anthracitic, and steam coals previously examined, in that they enclose 

 hydride of ethyl, and most probably Cgll^, and all the gases of the 

 paraffin series. F. W. R. 



Trautschold, H. [Siberian Minerals.] N. Jahrh. Heft vi. pp. 635, 

 636. 



Notes on minerals received from gold-washings in E. Siberia, including 

 samples of hlack-gold. These are found to consist of brilliant nuclei 

 of gold surrounded by a dark-coloured incrustation. P. "W. E,. 



Trechmann, Dr. Ch. 0. Beitrage zur Kenntniss des Turnerit. 

 [Turnerite.] N. Jahrh. Heft vi. pp. 593-601 ; plate. 



Examination of crystals of Turnerite from the Binnenthal and the 

 Tavetschthal. Gives a table of forms, and compares them with those 

 of Monazite. — |-Poo is new for Turnerite. The axial ratios are a:h:c 

 = 0-958444 : 1 : b-921696. /3=77° 18'. The Binnenthal crystals were 

 too opaque to allow of determination of their optical constants. The 

 Tavetsch crystals were partially examined. Dispersion in oil p < v. 

 For red yu=l-4706, for green = 1-47475. 2E = 34° 12' red, 34^48' green. 

 Pleochroism was determined. The crystals were too small and rare 

 for quantitative analysis ; but the presence of phosphoric acid and 

 cerium was determined. Not sufficient material for taking sp. gr. 



F. W. K 



Tschermak, [Prof.]. Entstehung einer schaligen Textur im Steinsalz 



durch Schlag. [Development of a Shaly Texture in Rock-salt by 



Impact.] Min. Mittli. Heft iv. pp. 242, 243 ; part of plate and 2 



woodcuts. 



Rock-salt from Szlatina in the Marmaros contains small cup-shaped 



concretions {JS'dpfchen), which, like the surrounding mass, consist only 



of salt. They exhibit a concentric shaly structure, which has probably 



been developed by blows of the hammer in working the salt. The heat 



resulting from impact may have aided it, but was not sufficient to fuse 



the salt, as has been suggested. F. W. R. 



T[schermak ?]. Yerwandlung von Grammatit in Talk bei Gegenwart 



von Olivin. [Alteration of Grammatite into Talc in Presence of 



Olivine.] Min. Mitth. Heft i. pp. 65, m. 



Note on occurrence of talc pseudomorphous after grammatite, and 



associated with olivine partially altered into serpentine. Observed by 



Dr. Fuchsofer in the Koralp, Carinthia. Notable for its bearing on 



the genesis of serpentine. F. W. R. 



. Ueber Leucite. Min. Mitth. Heft i. pp. QQ^ 67. 



A properly-cut section of leucite from the lava of Acquacetosa, near 

 Rome, was dark in parallel-polarized light, showed a cross in converging 

 light, and tested with the mica-plate was found to be negative. An 

 analysis of the mineral given. F. W. R. 



