MINERALOGY. 235 



last paper (see Geological Record for 1874, p. 227) : — one from Lerni, 

 Delaware Co., Pa. ; the other from Pelham, Mass. Analyses of both 

 are given. Concludes that all vermiculites are imisilicates ; that they 

 combine with water in several definite proportions ; and that the only 

 essential difference between the varieties is in the ratio between the 

 sesquioxide and protoxide bases, since all vermicuhtes may be reduced 

 to the condition expressed by the ratio 2:2:1 [atomic ratio, or oxygen 

 ratio between the silica, the bases, and the water]. F. W. R. 



Dana, Edward S. Second Appendix to the Pifth Edition of Dana's 

 Mineralog}'. Pp. x, 64. 8vo. Nnv York. 



Prepared, with the co-operation of Prof. J. D. Dana, to render the 

 original work complete up to Jan. 1875. It therefore includes de- 

 scriptions of all species announced as new within the preceding 7 years, 

 excepting those which appeared in the first Appendix. A list of the 

 more important recent mineralogical works is added. F. W. R. 



. Note on " Mineralogical Contributions, V., by Prof. C. Klein, 



in Heidelberg." Amer. Journ. ser. 3, vol. x. p. 61. 



On the Chondrodite from the Tilly-Foster Iron Mine, Brewster, 



New York. Amer. Journ. ser. 3, vol. x. pp. 89-103 ; 3 plates, 2 

 figs. Also Trans. Connecticut Ac. Sci. vol. iii. pp. 67-69. 

 A crystallographic description of the chondrodite described by Prof. 

 Dana. [See Geological Record for 1874, p. 228.] Chondrodite is 

 identical with humite in chemical composition and crystalline form ; 

 but the humite crystals are of 3 types, whilst hitherto the chondrodite 

 has been found of only one type. Mr. Dana now shows that the Tilly- 

 Foster specimens represent all 3 types. The results of optical studies are 

 given, and a chemical analysis of crystals of the second type. F. W. R. 



Dana, Prof. J. D. Doubtful Minerals. Chem. Neivs^ vol. xxxi. pp. 



160, 161. 

 Defends the use of the name chalcopyrite, and advocates nomen- 

 clature derived from classical sources. 



Daubree, [Prof.] ^ur la formation contemporaine, dans la source 

 thermale de Bourbonno-les-Bains (Haute-Marne), de diverses 

 espc'ccs minerales cristallisces. notamment du cuivre gris antimonial 

 (Tetraedrite), de la pyrite de cuivre (Chalkopyrite), du cuivre 

 panache (Philippsite) et du cuivre sulfure (Chalkosiue). [The 

 Recent Formation of Tetrahcdrite, Chalkopyrite, Philij^psite, and 

 Chalkosite in the hot Spring of Bourbonne-les-Bains (Haute- 

 Marne).] Compt. Rend. t. Ixxx. pp. 461-469. 

 Roman coins and other objects in bronze, silver, and gold have been 

 found in draining a Roman well (ptiisard) at the thermal springs of 

 Bourbonne-les-Bains ; and beneath these occurred a bed of fragments 

 of rock cemented by crystallized compounds resembling natural minerals. 

 They include : — chakosite, in crystals like those of the copper-glance of 

 Redruth ; cojyper-pij rites both in octahedra and mamillatcd ; varie- 

 gated copper-ore in regular octahedra and cubes ; and antimonial grey 



