MDTEBALOGY. 235 



eating the forms of the hexagonal system, and shows how Miller's 

 method may be applied to this system so as to bring the symbols into 

 relation with those of the tetragonal system. P. W. K. 



GiTM^Lnjs, Otto. Quarts och bergkristaller i kornig kalksten. 

 [Quartz and rock-crystal in granular limestone.] Geol. foren. 

 Stockholm Forhandl. bdt. i. pp. 31, 32, 1 fig. in text. 

 Analysis given and petrological description. From localities in the 

 Orebro district. 



Cuprit fr^n Bengtstoi^. [Cuprite from Bengtstorp.] Geol. 



foren. Sockholm Forhandl. bdt. ii. p. 126. 



. Mineral frSn Bjelkes grufva p§, Areskutan. [A mineral 



from the Bjelkes mine in Areskutan.] Geol. foren. Stockholm 

 Forhandl. bdt. ii. pp. 127, 128, 



Analysis given. Formula, IIO.SO3 + ^fl^. 3SO3 + 24H0. 



. Myrmalm frSn Jiirlehyttan. [Bog-ore from Jarlehyttan.] 



Geol. foren. Stockholm Forhandl. bdt. ii. pp. 128, 129. 

 The percentage of iron of this ore was 52. 



Habets, a. Les minerais de fer oolithiques da Luxembourg et de 



la Loraine. Pp. 27, 3 i)lates. 8vo. Liege. 

 Eeissue of a paper read at the Liege meeting of the Iron and Steel 

 Inst, of Gt. Brit. 1873. 



Hagen, Dr. H. A. On Amber in North America. Journ. Ap. 

 Sci. vol. V. no. 56, pp. 122, 123. 



Draws attention to an American paper published in 1821, contrasts 

 the formation in which amber occurs in America with that of Prussia, 

 and notices American localities. "W. W. 



Hahn, Daniel. Die Phosphorescenz der Mineralien. Zeitsch. 

 gesam. Nat. N. ser. Bd. xi. pp. 1-37, 131-213. 



After an historical sketch of our knowledge of the phosphorescence of 

 minerals, he describes the phenomena of phosphorescence, of which four 

 kinds are recognized — by heating, by insulation, by electricity, and by 

 molecular disturbance. Kesults are given of a series of investigations 

 on i)hosphorescence by heating. F. W. 11. 



■ Entwickelung der Ansichten uber die chemische Constitution 



der natiirlichen Silicate. [Development of views on the chemical 



constitution of the natural Silicates.] Zeitsch. gcsam. Nat. N. 



ser. Bd. x. pp. 289-338. 



An historical essay, giving analyses of the views of ancient and 



modern chemists on the constitution of mineral silicates. 



Hamlin, A. C. Origin and Properties of the Diamond. Proc. Amer. 

 Assoc, vol. xxii. B, pp. 104-108. 



Hankel, W. Ueber die thermoelcktrischen Eigenschaftcn dos 

 Topases, des Schwerspathcs und dcs Aragonites. Pogg. Ann. 

 Jubelband, pp. 649-661. 



