216 PETROLOGY. 



An examination of Prof. Nordenskiold's conclusions as to the 

 meteoric derivation of the native iron associated with basalt near 

 Disco, and of Dr. Nauckhoff's observations and analyses, on which 

 they were in part based. Thinks it of telluric origin, brought up with 

 the basalt or chemically separated within it. Doubts the bedded cha- 

 racter of the basalt, among which it was supposed to have fallen ; states 

 the breccia and pebbles to be due to re-cementing, or only apparent ; 

 describes the iron as occurring not only in lumps and plates but also as 

 dendritic ; and while asserting the eukrite of Nauckhoff to be basalt 

 peculiarly -feathered, throws doubt on the genuineness of his troilite. 

 Describes his discovery at Assuk, AVaigat Strait, of native iron, finely 

 sprinkled through basalt, the largest speck '45 mm., associated with 

 small knots of graphite, and giving traces of copper, cobalt, and nickel, 

 together with phosphoric acid. H. M. 



Steenstrup, K. J. V. Uber das Eisen von Gronland. [The Greenland 

 Iron.] Zeitsch. deutsch. geol. Ges. Bd. xxviii. Heft 2, pp. 225-233. 



Translated and abridged from the Danish by C. Rammelsberg, who 

 adds comments. Concludes that the Ovifak iron is probably not 

 meteoric ; the basalt is much altered near the iron ; the rock ac- 

 companying the iron is not eucrite, since the felspar is shown to be not 

 anorthite. E. B. T. 



Stelzner, A. [Varallo Eocks.] Zeitsch. deutsch. geol. Ges. Bd. xxviii. 

 Heft iii. pp. 623-625. 



Describes rocks from the nickeliferous-pyrites locality of Yarallo, 

 Yal Sesia ; one is a hornblende-rock with chromespineU, the other a 

 bronzite-gabbro, with olivine, hornblende, and bronzite in about equal 

 parts. E. B. T. 



Steudel, Prof. Material der Steinwaffen aus den Bodenseei^fahl- 



bauten. [Material of the Stone Weapons from the Bodensee 



Lake-dwellings.] Jahresh. Ver. JSat. Wiirtt. Jahrg. 32, pp. 75- 



90. 



Describes verrucano, hornblende-rock, quartz, spilite, serpentine, 



firestone, and nephrite. 



Stoddart, W. W. On Auriferous Limestone at Walton. Rep. Brit. 



Assoc, for 1875, Sections, pp. 81, 82. 



The specimen was from the Carboniferous Limestone near Clevedon, 



containing 94 p. c. of carbonate of lime. Silver varies from 94 grains 



to nearly an ounce per ton ; gold from 3 to 5 grains per ton. The 



limestone was more weathered than the rest of the beds. W. T. 



Svedmark, E. Mikroskopisk undersokning af uralit-porfyr frSn 



Yaksala. [Microscopical Besearches on Uralite-porphyry of Yak- 



sala, Sweden.] Geol. F'oreyi. SfocJchohn lorh. Bd. iii. pp. 151-164. 



Describes the microscopical structure of the rock. In a crystalline 



matrix of partly transformed hornblende are imbedded crystals of 



plagioclase, hornblende, uralite, titaniferous iron, pyrite, epidote, 



