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PETROLOGY. 209 



chytes and granites. Plutonic rocks are not necessarily connected with 

 volcanic eruptions, though volcanic rocks must be connected with plutonic 

 masses. Owing to imperceptible gradations, the division into acid and 

 basic is found unsatisfactory in the field. W. H. D. 



King, Prof. W., and Prof. T. H. Rowney. On the Serpentinite of 



the Lizard — its original llock-condition, Methylotic Phenomena, 



and Structural Simulations of Organisms. Phil. Mag. ser. 5, vol. i. 



pp. 280-293, plate ii. 



Regard the serpentine as the result of metamorphism, in some cases 



of an igneous, in others of a metamorphic rock. The included crystals 



are pseudomorphs after pyroxene ; associated chrysotile, calcite, or 



dolomite are rare, especially the last two. Call attention to various 



microscopic stinictures which are considered to simulate organisms, 



Buch as foraminifera and corals. T. G. B. 



Klunge, A., and M. de Tribolet. Etudes Ge'ologiques et Chimiques 

 sur quelques gisements de calcaires hydrauliques de I'Oxfordien 

 et de I'Astartien du Jura Xeuchatelois et Yaudois. [Oxfordian 

 and Astartian Hydraulic Limestones of the Neuchatelese and 

 Yaudois Jura.] Bull. Soc. Vaud. Sci. Nat. ser. 2, t. xiv. pp. 65-90. 

 [See Tribolet, Geological Record for 1874, p. 103, and 1875, 

 p. 397.] 



Many analyses (by Zlunge, Kern, Mathey, Brelaz, and Bonjour) of 

 limestones, generally both before and after calcination. 



Knop, A. Der vulkanische Kaiserstuhl im Breisgau. [The Kaiser- 

 stuhl in Breisgau.] N. Jahrh. Heft vii. pp. 756-760. 



This hiU represents an old submarine volcano, and consists mainly of 

 dolerites, some peculiarly rich in olivine, forming the variety Limbimjite. 

 Phonolite occurs in dykes, and is sometimes marked by large crystals of 

 sanidine (sanidine-phonolite), or by hauyne (hauyne-phonolite), or by 

 leucite (leucite-phonolite). True trachytes are not found ; and the 

 author believes that Neis's rock '•^ sanidinite^'' was founded on loose 

 transported blocks. Titanic acid is found in many of the rocks and 

 minerals of the Kaiserstuhl ; thus limburgite yielded 4*33 p. c. A 

 full description of analytical methods for separating titanic acid is 

 given. F. ^V. R. 



Lagorio, A. Microscopische Analyse ostbaltischer Gebirgsarten. 

 [Microscopical Analysis of E. Baltic Rocks.] Arch. Nat. Liv- Ehst^ 

 Kuflands, ser. 1, Bd. viii. Heft ii. pp. 145-299. pis. i.-v. 

 Description of limestone, serpentine, massive crystalline rocks, schists, 

 and clastic rocks. 



Lasaulx, A. von. [Rocks from near Treves.] N. Jahrb. Heft ii. 

 pp. 175-178. 



Notices of porphyry from near Gottesberg, and of the diorite of 

 Kiirenz. The porphyry is nearly snow-white, almost destitute of 

 quartz, and decomposes with great ease. The diorite contains horn- 



1876. P 



