MINERALOGY. 235 



affecting only the oligoclase, &c. ; analyses of Grodno sandstone and 

 atljacent porphyry are compared. Dolomitization is shown by the 

 action of magnesic chloride on calcic carbonate. The absence of zeolites 

 in granites is exemplified by a series of experiments on the action of 

 alkaline salts on leucite, nepheline, «S:c. ; an artificial silicate with the 

 composition of analcime was formed by sodium salts acting on leucite ; 

 and this was reformed by treating analcime with potash salts. A 

 genetic relationship between Gmelinite and Herschellite is proved by 

 experiments ; also between mesolitc and natrolite. A compound similar 

 to Edingtonite was formed, and substitutions effected in chubasite, 

 Thompsonite, stilbite, &c. From experiments on kaolin, «S:c. it is 

 deduced that the action of soils is a purely chemical one, a silicate 

 valuing according to the salts which percolate through it ; ammonia 

 salts are shown to act on silicates like other alkalies, so that 

 no intervention of humus is necessary. A mineral from Vesuvius is 

 analyzed, and shown to be a lime-cancrinite, or anorthite with carbonate 

 of lime. Pyrochemical reactions illustrate the genesis of the sodalite 

 group. Again the relation of pachnolite and arksutite is elucidated b}"^ 

 the action of calcic chloride on cryolite. E. B. T. 



Leuchtenberg, Duke N. de. Les proprietes de la Leuchtenbergite 

 sous le microscope dans son etat pur et metamorphose. [Leuch- 

 tenbergite, original and altered.] Bull. Ac. Imp. Sci. St. Peters- 

 boury, t. xxii. pp. 502-512. 



Mikroskopische BeschafFenheiten des griinen Avanturins aus 



Indien. [Microscopic Structure of Green Avanturine from India.] 

 Bull. Ac. Imp. Sci. St. Petersbourg, t. xxii. p. 512. 



Lill, — von. Analysen, ausgefiihrt im Laboratorium des k. k. 

 General-Probiramtes in Wien in den Jahren 1875 und 1876. 

 [Analyses of Minerals and Rocks.] Jahrb. Jc.-l-. Berg-Akad. 

 Bd. xxiv. no. 4, pp. 328-340. 



Liversidge, Prof. A. The Minerals of New South Wales. Trans. 

 11. Soc. N. S. Wales, vol. ix. pp. 153-215. 



A catalogue, comprising idb metallic and 81 non-metallic minerals 

 and their varieties. Some analyses are given ; and the localities are 

 named, with notes on the mode of occurrence and other characters of 

 the species. R. E. 



Lundstrbm, C. H. Analys af ett egendomligt talksilikat frSn 

 Nordmarken. [Analysis of a peculiar Magnesian Silicate from 

 Nordmark, Sweden.] Geol. Foren. StocJcJiolm Fbrh. Bd. iii. pp. 191, 

 192. 



The analysis leads to the formula 3MgO-|-2SiO^-l-2HO, a composi- 

 tion agreeing fairly well with that of the serpentine. 



McCreath, Andrew S. Report of Progress in the Laboratory of 



