IIINEHALOGT. 233 



Kitton, P. On the Origiu of Flint. (Norwich Geol. Soc.) Eastern 



Dally Press, April 7. 

 Considers that the Chalk-flints have a spongious origin, and that the 

 flint-bands may have been due to the former presence of layers of pro- 

 toplasm similar to those which have been found to occur on the surface 

 of calcareous ooze at the bottom of the sea. Maintains that the decom- 

 position of this organic matter caused a deposition of silica, as evidenced 

 by the sponges which have led to the formation of the flint-nodules. 



H. B. W. 



Klein, Carl. Einleitung in die Krystallberechnung. [Introduction 

 to Crystallographic Calculations.] Pp. vi, 394 ; 12 plates, 196 

 woodcuts. 8vo. Stuttgart. 



[Humite.] N. Jahrh. Heft vi. pp. 633-635 ; woodcut. 



Crystallographic and optical examination of two crystals of humite 

 from Vesuvius, belonging to type III. The results show that they are 

 not rhombic, but clinorhombic. This agrees with E. S. Dana's con- 

 clusions from the examination of crystals of types II. and III. from 

 the Tilly Foster Mine. F. W. II. 



Kloos, J. H. [Hemimorphism of Calcite.] N. Jahrh. Heft iv. pp. 

 413-415. 



Crystals of calcite from Brigels, Tavitschthal, exhibit hemimorphism ; 

 thus some are terminated at one end by the scalenohedron E3, and at 

 the other by the rhorabohedron — |R. Believes this to have been 

 previously unobserved. F. W. R. 



Knop, Dr. A. System der Anorganographie. [System of Anorgano- 

 graphy.] Pp. xxviii, 296. 8vo. Leipzig. 



Zur Verstiindigung uber Pachnolith und Kryolith. [On 



Pachnolite and Cryolite.] N. Jahrh. Heft viii. pp. 849-854. 

 Two varieties of pachnolite have been described ; and analyses are 

 here collected from different authors to show their identity. Wiihler 

 has sei)arated *'var. A" under the name oi Pyroconite. Konig's Thom- 

 senoUte is identical with pachnoUte. Knop and Vom Hath have re- 

 garded pachnolite as probably rhombic ; Des Cloizeaux and Dana as 

 monoclinic ; and Websky as triclinic. F. W. R. 



Lasaulx, A. von. [New Minerals.] N. Jahrh. Heft ii. p. 175. 

 Preliminary description of Melanophlogite and Aerinite (see below). 



. Mineralogisch-krystallographische Notizen. [Mineralogico- 



crystallographic Notes.] Erste Folge. N. Jahrh. Heft iii. pp. 250- 

 278, plate : and Heft iv. pp. 352-368. 

 Melauo2ihhgite is a new species containing 86 p. c. of silica, with 

 water and sulphuric acid. It crystallizes in minule white or light- 

 brown cubes, having H = 7 and S. G. =2-04. Becomes black, B. B., 

 whence the name. It occurs with calcite and celestine on the sulphur 



