PETBOLOGT. 215 



him, to the ductile nature of silicates, which makes them remain a long 

 time in a semifluid state before solidifying. G. A. L. 



Vbba, Dr. Kakl. Beitrlige zur Kenntniss der Gesteine Siid-Gronlands. 

 [Contributions to knowledge of the rocks of S. Greenland.] Sit- 

 zungsb. k. Ak. Wiss. math.-nat. CI. Abth. i. Bd. 69, pp. 61-122, 

 with 2 chromo-lithographs and 1 plain plate. 



The rocks examined are gneiss fi'om island Illuidlek ; plagioclase is 

 the predominant felspar, but orthoclase is present ; the quartz con- 

 tains needles of apatite, mica, and cavities with liquid. The granites are 

 mostly coarse-grained ; analyses of some are given ; a syenitic granite 

 containing arfvedsonite &c. is described. Eudialite-syenite from Kit- 

 tisut Island contains elicolite, hornblende, felspar (plagioclase chiefly), 

 but no zircon. Orthoclase-porphyry occurs as dykes in granite &c. 

 having a glassy paste. Diorites are found both on the E. and W. 

 side of S. Greenland ; plagioclase and orthoclase are always present, 

 hornblende &c.; some are quartz-bearing. In one case the felspar 

 crystallized after the hornblende. Diabase seems restricted to a few 

 localities. Labradorite, the prevailing felspar, shows polysynthetic 



cles, and contains fluid-cavities, apatite-needles, &c. Gabbro, an 

 eruptive rock consisting of plagioclase, diallage, and mica, occurs at 

 the entrance of the Lichtenau fjord. E. B. T. 



Westphal, Major. Beschreibung eines Porphyrganges mit losen 

 Orthoklaskrystallen im Elbthalgebirge. [Porphyry-dyke with 

 crj^stals of orthoclase.] N. Jahrb. Heft 1, pp. 33-37. 



A vein of quartz-porphyry, partly decomposed and with many crystals 

 f orthoclase, occurs on the left bank of the Elbe near Niederwartha. 



WiJRTz, H. Outline report on * Greenland Coal,' or Lignite, brought 

 from the mines at Disco Island by the U.S. steamer * Juniata,' in 

 1873. Proc. Lye. Nat. Hist. N. York, ser. 2, pp. 119, 120. 



Original full report in ' American Chemist,' vol. iv. p. 401. 



Yardley, H. B. Analysis of Jerusalem Coprolites. Chem. News, 



xxix. no. 761, p. 280. 

 A sample of ground coprolite, said to have been sent from Jerusalem, 

 contains 11*05 p. c. of phosphoric acid. Complete analysis given. 



See also the following : — 



Anon. Analysis of rocks, Belfast; p. 1. 



Baejtett, a. K. Elvans, Cornwall : p. 2. 



Cox, E. T. Analyses of limestones &c., Indiana: p. 113. 



DuviLLiER, — . Analysis of clay, Boulonnais : 48. 



Hartt, C. F. Analysis of limestone, Tapajos: p. 118, 



Jones, Prof. T. K. Description of specimens from Griqualand "West, 



in Sxow's paper : p. 147. 

 Schmidt, A., 11. Chauvenet, &c. Analyses of rocks, Missouri, Sco 



BROADnEAD, p. 111. 



