110 Fourth Supplement to Dana's Mineralogy. 



Lancasferlle is retained as a species, although shown to be identical with hydfO'* 

 fnag7iesit€ by Smith and Brush. Hydromagnesite is placed as a subspecies undet 

 Mag?iesiie, and no note is taken of its crystallization; while llydro-nicJcelmagne' 

 mt€j S., is numbered among good species, althougli very doubtful. WiUiamsite, S., 

 is retained as a good species, and the more recent analyses, which show that it is 

 serpentine, are not referred to. The same is true of FicroUte or Chrysotile. Mar- 

 molite is made a subspecies under Kerolite, and the later analyses which connect 

 it with serpentine are not mentioned. Dysyyitrihite^ S., also stands as a species, 

 without a reference to the analyses of Smith and Brush, which prove it to be a rock; 

 while Pyrophyllite (a Pilicate of alumina) is placed as a variety of Talc, Vermku- 

 lite is also added to talc, without a reference to Crossley's investigations. 



Nevialite is separated from Brucite, of which it is a fibrous variety. Jenkinsitef 

 S., stands as a good species, and Antigorite appears to be placed as a subspecies 

 under it ^o reference is made to Smith and Brush's analysis of the Jenkinaite, or 

 to the analyses of Whitney and others of OzarJcite^ S., which set aside his results. 

 Eiiphyllite is arranged under Margarite, although the analyses of Smith and Brush 

 show it to be distinct, Unionite is retained as a good species although shown by 

 Smith and Brush to be oligodase^ the only intimation of a relation to oligoclase 

 being given in the Index; and Crocidolite and Carpkolite come in with a star (*) 

 before the names, directly after Unionite, as if some way subordinate to that spe- 

 cies. Under Boltonite no mention is made of the later analyses of that species by 

 Smith which show a relation to Chrysolite. Dnnhurite is published in the same 

 way, giving the older wrong analysis, instead of the later by Smith and Brush. The 

 American Oligoclase and its analyses are not alluded to, 



^ The first part of the work, which treats of the species above mentioned, was pub- 

 lished five years since, and this would be a sufScient apology for some of the omis- 

 sions. But the title page for the whole work bears the date 1857, and there is, at 

 the close, an Appendix, besides a supplementary one at the commencement, both re- 

 cently printed, where we look in vain for the corrections that would bring the work 

 ^»wn to the year 1857. "We should not detail such omissions, were it not import- 

 ant that the fects with regard to American minerals should be fully presented. An 

 American work should do better justice to American species and analysts. 



On the species, in the second part, Warwickltc, Pyromcla7iC, Parathorlte, Bis- 

 7nuthaurit€y Calyptolite^ Chathainiley Glosseco/iite^ Moronolite^ Rastolyte^ and others, 



we offer some observations beyond. Parophite^ made a species on p. 428, was 

 described as a rock by Mr. Hunt. JTardfutane is without analysis ancl notinng is 

 presented to show tliat it is anything more than a decomposing sphene ; there is 

 no evidence given that a species has resulted from the alteration. Placodine stands as 

 a good species on p. 313, although shown to be a furnace product in Pogg., Ixxxir, 

 585, and Ixxxv, 46. 



Dr. D. D. Owen : Report of the Geological Survey in Kentucky, made during the 

 years 1854 and 1855, R. Peter, Chemical Assistant, S. S. Lyon, Topographical As- 

 sistant. 416 pp. 8vo, with many plates and maps. 



OscAE M. LiEBER : Report on the Geological Survey of South Carolina, being the 

 first Annual Report. 136 pp. Svo, with many maps and plates. 



Dr. Adolph Gcrlt: Der pyrogenneten kunstlichen Mincralien, namenthch der 

 krystallisirten Hiittenerzeugni--se. 100 pp. Svo. Freiberg, 1867.— A work review- 

 ing what is known on the artificial formation of minerals. 



2. Crystallization^ Formation of Minerals^ etc. 



E. Pasteue: On the modes of increase in Crystals and the causes of variation of 

 secondary forms, Ann. d. Ch. et de Physique, [3], xlix, p. 5, Jan. 1857. 



F. vox Kobell: Observations with the Stauroscope and on Pleochroism. J. f pr- 

 Chem., Ixv, 321, Ixix, 217. 



T. ScHEEUEE : Polymerous Isomorphism. J. f pr. Chem., Ixviii, 310, 



: On Pseudomorphs (" After-Krystalle"). 41 pp. Svo. Braunschweig, in 



Lieb. Pogg. u. Wohler's Handworterbuch, 2te Aufl. 



F. KuHLMAx: Formation of minerals by the wet way. Compt. Rend., slii, 374. 



