PETEOLOGY. 211 



quartz, with a siliceous cement. The specimen contained many irregular 

 opaque specks, apparently ferruginous, as analysis showed the presence 

 of iron. E. T. N. 



Muck, F. Chemische Beitriige zur Kenntniss der Steinkohlen. [Che- 

 mical Contributions on Coals.] Pp. 40. Bonn, 



Neminar, Dr. E. F. Die Eruptivgesteine der Gegend von Banow in 

 Mjihron. [Eruptive Hocks of Bauow, Moravia.] Min. M'ltth. Heft 

 iii. pp. 143-150. 

 A microscopic and chemical description of hornblende-andesites, 

 augite-andesites, and felspar-basalts. Many of these, even when fresh, 

 contain minerals of secondary formation, such as calcite, siderite, py- 

 rites, limonite, &c., the origin of which is referred to the neighbouring 

 rocks. E. W. II. 



Oberg, K. V. Analyser af Svenska dioriter. [Analyses of Swedish 

 Dioritcs.] Academical Treatise. Pp. 26. 8vo. Upsala. Abstract 

 in Geol. Foren. Stoclholm Fork. Bd. iii. pp. 188-191. 



14 analyses given, with the method of analysis. 



Patterson, Karl. [Eukrite.] K Jahrh. Heft ii. p. 174. 

 The beautiful rock Eulcrite occurs in large masses on the island of 

 Seiland, S. of Hammerfest. 



. [Enstatite Gneiss.] N. Jahrh. Heft v. pp. 515, 516. 



Fragments of an almost pure enstatite gneiss were found at a great 

 height on the Slunkas Berg in Nordland, Sweden. It is hard to account 

 for their presence. Suggests the bare possibility of their meteoric 

 origin. E. W. 11. 



Phillips, J. A. On the so-called " Greenstones " of Western Corn- 

 wall. Quart. Journ. Oeol. Soc. vol. xxxii. pp. 155-178. 



Gives results of microscopic and chemical analyses of the so-called 

 greenstones of the Penzance district ; concludes that they belong princi- 

 pally to three classes : — 1. Gabbros or doleritcs, in which the original 

 minerals are to a great extent unchanged, but are sometimes almost 

 wholly replaced by pseudomorphs ; 2. Ordinary clay-shales (killas) ; 3. 

 Highly basic hornblcndic rocks, fissile, and presenting microscopically 

 the characteristic appearance of metamorphic shales. Most of the 

 greenstones of the Cape Cornwall district are hornblcndic slates. Tho 

 slaty and doleritic rocks of St. Ives and Gurnard's Head resemble those 

 of Blount's Bay. The hornblende slates contain about 10 p. c. less silica 

 than the crystallized pyroxcnic rocks. T. G. B. 



Phipson, Dr. T. L. On the Tripolite of Barbadoes. Chem. News, 



vol. xxxiv. no. 876, p. 108. 

 Contains original analyses of tripolite from Barbadoes and from 



p2 



