1893.] Mineralogy and Petrography. 903 
ville” has given the results of analysis of several American minerals as 
follows: Natrolite (I) from Magnet Cave, Ark.; a light-colored tour- 
maline (II) from Nevada Co., Cal.; spessartite (IIT) from Llano Co., 
Texas, and bismuthinite from Sinola, Mexico. Figures follow: 
SiO, ALO, Fe,O, FeO MnO CaO MgO K,O Na,O H,O F B,O, 
I 47.56 26.82 .20 13 .09 15.40 9.63 
II 36.4033.64 3.13 151 10.01 .12 2.49 3.53.748.74 
III 35.93 18.08 4.60 31.77 8.48 .69 n ui .36 
The spessartite contains also traces of TiO, and BaO. 
Mineralogical News.—W. Ramsay" has discovered zonal growths 
of epidote substance in crystals of this mineral from the Sulzbachthal 
in Salzburg, Zóptan in Moravia, Arendal in Norway, Haddam, Conn., 
and from Traversella, Brosso and Ala in Piedmont. The different 
zones possess not only different colors, but they have also different 
extinction planes and diffent refractive indices, as do also different por- 
tions of the same zones. 
Fragments and small crystals of carbon with all the physical prop- 
erties of earbonado have been prepared by Moisson™ upon dissolving 
carbon in iron and cooling the mass slowly under pressure. 
Miscellaneous.—McMahon? has elaborated a systematic course 
in micro-chemical analysis based on the production of the sulphates 
and double sulphates of the elements. These salts are described as 
they appear on the object glass under the microscope, their habits are 
depicted and their constant peculiarities, if they possess any, are por- 
trayed with some minuteness. The methods of analysis developed by 
the author will prove of great convenience to petrographers if they are 
found as practicable as they are declared to be. 
The eighth volume of the mineral resources of the United States, 
edited by Dr. D. T. Day,” contains statistical data for the calendar 
year 1891. The total value of metallic products mined during this 
period amounts to over $181,000,000, and that of the non-metallic 
products over $241,000,000. The most notable article in the volume 
is an historical description of the past * twenty years of progress in the 
manufacture of iron and steel in the United States.” 
21 Ib. XLV, 1893. p. 404 
7: Bull. No. 90. U.S. Geol. Surv ey, p- s 
? Neues. Taner b. f. Min., etc., 1893, I, p 
** Comptes Rendus, Fe b.6. Ref. in eniro. Feb. 16, 1893, p. 57 
d essa e somete X, p. 19. 
urces of ‘the U. S. Calendar year, 1891. Washington. 
Gon Pasing Office, 1893 
