MINEBALOOT. 



227 



de fer dans des sources thermales et dans Teau de la mer. [Recent 

 Formation of Iron Pyrites in Thermal Springs and in Sea-water.] 

 Bull. So«. Geol. France^ 3 ser. t. iv. pp. 53, 54. 

 Resume of the paper noticed in the Geological Record for 1875, 

 p. 236. 



Daubree, Prof. Formation contemporaine de diverses Especes Mine- 

 rales sous Taction des Sources Thermales. [Formation of Minerals 

 by Thermal Springs.] Compt. Rend. Assoc. Frang» 1875, pp. 687- 

 689. 



Enumerates several minerals formed by thermal springs. See Geo- 

 logical Record for 1875, p. 236. 



Des Cloiseaux, Prof. A. Memoir on the three new types of Humite. 

 Phil. Mag. ser. 5, vol. ii. pp. 286-291. 



The different forms of humite have been referred to three types 

 belonging to the orthorhombic system. In consequence of examination 

 of the optical characters, the author removes type II. (yellow humite, 

 Vesuvius, brown chondrodite, Sweden) and III. (pale yellow and white 

 humite, Monte Somma) to the clinorhombic system. Proposes to re- 

 strict humite to the orthorhombic form, chondrodite to type II., and to 

 call III. provisionally clinohumite. T. G. B. 



[Humite.] N. Jahrh. Heft vi. pp. 640-645 ; 4 woodcuts. 



Crj^stallographic and optical description of Humite. Only type I. is 

 rhombic, the two others being monoclinic. Restricts the term Humite 

 to type I. ; uses CJiondrodite for type II., and Clinohumite for type 

 III. Tables of observed forms and goniometric determinations are 

 given, with figures illustrating the optical characters. F. W. R. 



Doelter, C. Mineral! del Monzoni nel Tirolo meridionale. Boll. 



R. Com. geol. Ital. vii. pp. 84, 85. 

 Table of minerals, &c., extracted from the paper in Min. Mitth. See 

 Geological Record for 1875, p. 239. 



Die Bestimmung der petrographisch wichtigeren Mineralien 



durch das Mikroskop. [Microscopic Determination of the Principal 

 Petrographic Minerals.] 8vo. Wien. 1876. Pp. vii, 36. 

 Describes the preparation of sections ; the best form of microscope ; 

 the use of the micrometer, polariscope, and dichroiscope ; chemical 

 tests ; structure of minerals ; microscopic enclosures ; value of morpho- 

 logical and optical peculiarities ; and gives tables for the diagnosis of 

 minerals under the microscope. F. W. R. 



Eck, H. [Relation between different Species grown together.] N, 



Jahrh. Heft iv. pp. 405-409. 

 Discusses the law of growth between quartz and calcite, and recog- 

 nizes the work of Breithaupt. 



Engstrom, N. Analys af s. k. Ijus knebelit frSn Dannemora. [Ana- 



q2 



