224: MINERALOGYr 



Behrens, H. Die Krystalliten : mikroskopische Studien iiber ver- 

 zogerte Krystalbildung. 8vo. Kiel. Pp. 115, 2 plates. 



Two kinds of crystallites are recognized, and probably two methods 

 of formation of crystals ; in one the growth is continuous, in the other 

 discontinuous. On observing, under high magnifying-power, crystal- 

 lization from watery and alcoholic solutions, the author finds that 

 minute but well-formed crystals separate at once from the solution ; 

 and he never observed the formation of globulites, as described by 

 Yogelsang. F. W. R. 



Berwerth, Dr. P. Ein Umwandlungsprodukt des Ludwigit. Min. 

 Mitt. Heft 3, pp. 247-250. 



Tschermak's new species, Ludivigite, from Morawitza, in the Banat, 

 is associated in some specimens with a brownish-red substance, which 

 is a product of alteration of the Ludwigite, and consists of hydrous 

 peroxide of iron, associated apparently with small quantities of brucite, 

 magnetite, talc, and calcite. Analyses of the Ludwigite and of the 

 alteration-product are given. F. W. B. 



Blake, James. On Nickeliferous sand from Frazer Biver. Amer. 



Journ. ser. 3, vol. vii. p. 238. 

 Condensed note from Proc. Calif. Acad. Sci. vol. v. p. 200 (? 1874). 



Blake, William P. Wood-tin in Georgia. Amer. Journ. ser. 3, 

 vol. viii. p. 392. 



Note of the discovery of minute grains of wood- tin in the residual 

 black sand from the sluices used in collecting gold, from the Nacoochee 

 valley. White County, Georgia. The usual minerals in the black sand 

 of Dahlonega, Georgia, are specular iron, magnetite, ilmenite, rutile, 

 cyanite, and garnet. G. A. L. 



Blomstrand, C. W. Manganosit, ett nytt mineral fran Yermland. 

 [Manganosite, a new mineral from Wermland.] Geol. foren. Stock- 

 holm Forhandl. bdt. ii. pp. 179-183. 



The composition of Manganosite is — protoxide of manganese 98*04, 

 protoxide of iron 0*42, magnesia 1*71, lime 0*16, = 100-33. 



Blum, Dr. J. Lehrbuch der Mineralogie (Oryktognosie). Ed. 4. 

 Pp. XV, 642, with 457 woodcuts. Stuttgart. 



Brauns, Dr. D. Ueber Hahn's Entwickelung der Ansichten liber 

 die chemische Constitution der natiirlichen Silikate. Zeitsch. 

 gesam.Nat. (new ser.) Bd. x. pp. 502-505. 



Criticism of Dr. BEahn's paper on the development of views on the 

 chemical constitution of natural silicates. 



Breithatjpt, Hermats^jst. Zur Asymmetric der tesseralen Krystall- 

 gestalten. N. Jahrb. Heft 4, pp. 403, 404. 



Letter stating that Prof. Breithaupt had just before his death dictated 

 an essay to show that crystals of certain mineral species belonging to 

 the regular system may be asymmetrically developed. F. W. B. 



