and Shepard's Treatise on Mineralogy. 349 



Brooke, (the expurgation of chemistry in this case, is quite in- 

 complete,) kraurite for green iron ore, Selbite for carbonate of sil- 

 ver, Beresofite for red lead ore or chromate of lead, Carinthite for 

 yellow lead ore or molybdate of lead, &c. We think an author 

 who feels compelled in justice to Count Bournon, to revive the 

 obsolete trivial name oi jibrolite and substitute it for the well es- 

 tablished and wmv e'csdX Bucholzite, should hesitate before rejecting 

 other original and unexceptionable terms for the mere "sake of 

 uniformity." 



A glance at the list of species will enable us to show how the 

 principles adopted by the author work in practice. If the science 

 of chemistry had never been heard of, we think this list might 

 have been somewhat shorter even than now. 



Quincite. This earthy hydrous silicate of magnesia is here re- 

 tained as a species, although even on chemical grounds it is hardly 

 distinct from Meerschaum. 



Lincolnite. This species, which was proposed by Prof. Hitch- 

 cock, has been generally considered as only Heulandite. Mr. Al- 

 ger has written a very satisfactory paper on this subject in Vol. 

 xLvi, p. 235, this Journal ; the specimens on which Mr. Alger's 

 opinion was founded and which were measured by Mr. Tesche- 

 macher with the reflecting goniometer, were received from Prof. 

 Hitchcock himself, and others v/ere obtained from the State collec- 

 tion, where they were deposited by Prof. H. Mr. Shepard cannot 

 object to this conclusion, founded solely on crystallographic char- 

 acters. 



Fibrolite. Under this name Prof. Shepard includes the species 

 Bucholzite and Sillimanite. We have already presented (Yol. 

 XLVI, p. 382) the chemical evidence which in our opinion would be 

 sufficient to unite kyanite and Sillimanite, (as Mr. Connell had pre- 

 viously proposed,) but the crystallographic evidence for their sepa- 

 ration is as good as in the case of Arragonite and calcareous spar. 

 Prof. Shepard says, (p. 138,) " The American Bucholzites belong 

 to Sillimanite; nor have we any valid ground for maintaining Sil- 

 limanite distinct from fibrolite," &c. As the question must be 

 decided, as far as it concerns our author, on purely statural his- 

 tory grounds, without regard to any chemical evidence, (however 

 cogent that may seem to others,) we would only say, that until 

 the diagonal cleavage and distinct crystalline form of Sillimanite 



Vol. XLVii, No. 2.— July-Sept. 1844. 45 



