109 Fourth Supplement to Danas Mineralogy. 



the oxygen ratio "between the bases and silica 1 : 2, the latter 

 1 : 1. The ratios 1 : 3 and 1 : 1^ characterize two other sections, 

 but each comprises only two species, and in both, one of these 

 has always been deemed doubtful. Leucophane has been the 

 type species for the ratio 1 : 1^. Bat the recent analj-ses of this 



Mel 



by Eammelsberg) show, that if the Jluorid of sodium be reckoned 

 as a base with the protoxyds (see beyond), the ratio of Melino- 

 phane becomes 1 : 1, which is the true Garnet ratio ; and^in Leu- 

 cophane the discrepancy from this ratio is small, being less 

 than in lolite. It is probable therefore that the section charac- 



be unrepresented. 



li 



Under the ratio 1 : 3, there are the species Mancinite and Edel- 

 forsite ; the first is based on a badly made analysis, (as the ac- 

 count of it manifestly shows,) and is not know^n at the locality 

 mentioned. The sooner it is struck from the science the better. 

 The species Edelforsite appears to be well sustained by Hisin- 

 ger's analyses, but rec[uires a new examination. 



1. List of Works. 



Dr. J. GuAiLiCH (Vienna) : Lehrbuch der Krystallograpliie von Professor W. H. 

 Miller, translated and enlarged. 328 pp., 8vo, with an atlas in 4to of 19 copper 

 plates. Wien, 1856. — Dr. Grailich 13 a profound "writer on matheraatics and in 

 physics, especially optics, and has contributed much by his re?earclies in optical 

 mineralogy and crystallography to the progress of the science. This t^an^^lntion of 

 Miller's Crystallography contains an important chapter on the optical characters of 

 various mineral species and many laboratory products. Dr. Grailich also published 

 in 1856 a paper entitled •'Brechung und Reflexion der Lichts an zwilliug.^fliichen 

 optLsch einaxigcr vollkommen durchsichtiger Medien " a continuation of a paper on 

 the same subject begun in 1855. We understand that he Las in preparation a work 

 on the physical characters of minerals. 



Dr. A. Kexxgott : Uebersicht der Resultate mineralogischer Forschungen im Jahre 

 1854, 180 pp.. small 4to. Leipzig, 1856. — Ibid, im Jahre 1855, 180 pp., small 4to. 

 Leipzig, 1856. 



+ 



LiEuio and Kopp's Jahresbericht, for 1855. Article **Mineralogie," pp. 903-985, 

 and "Cbemische Geologic," including meteorites, pp. 986-1029. 



K HEaMAN'x; Heteromeres Mineral-System, 213 pp. 4to, forming part rf volume 

 X, of the Nouv, Mem. de la Soc. Imp. des Natnralistes de Moscou. — A brief review 

 of the species, classified in accordance with Hermann's views on Heteroinerism, An 

 undue prominence is given to crystallography, and in consequence, the groups often 

 are not natural associations of species, 



N. VON KoKscHAROv: Materialen zur Mineralogie Russlands. St Petersburg. 

 This fine work, illustrated with many beautiful plates of crystals has been received 

 by us to page 304 of tlie second volume. 



QuiNTixo Sella (Turin): Studii sulla Mineralogia Sarda. 50 pp. 4to. Torino, 

 1856.— A paper on Twin Crystals of Calcite and Bome other species. Also by the 

 eame author, a very complete memoir "BuUe Forme Crlstalline dell' Argente Rosso," 

 (Turin Academy of Science, Feb. 1856,) in which be reviews the crystalline forms 



different 



giving 



