1889.] Mineralogy and Petrography. 1009 
etched surfaces of spiegeleisen, Meunier^" calls attention to the fact 
that we know almost nothing in regard to the nature of that constituent of 
certain meteorites which turns black upon being subjected to heat. He 
has been investigating the subject for many years, and now reports a 
few facts discovered by him with reference to the properties of the sub- 
stance. A meteoric iron found about the year 1880, on the top of 
the Alleghany Mountains, in Greenbriar County, West Virginia, weighs 
eleven pounds, has a specific gravity of 7.869, and contains cavities 
in which are masses of graphite. Upon treating a portion with hydro- 
chloric acid, Fletcher2i found fragments of chromite crystals in the 
insoluble residue. The composition is : 
Fe Ni Co Cu P S Residue 
The same author^^ gives an analysis of the Nejed iron, that fell in 
Central Arabia, in 1863. His figures are : 
Fe Ni Co Cu P S Insol. Sp. Gr. 
91.04 7.40 .66 tr .10 tr .59 7.863. 
The tenth meteoric iron whose fall is authenticated by eye wit- 
nesses, has been described by Mr. G. F. Kunz.^s It fell at Lamar, 
Johnson County, Arkansas, at 3.17 p. m., March 27th, 1886. The 
mass is in general flat and irregular in shape. It measures 17^^ in. by 
15/^ in., and weighs 10714 pounds. Its analyses yielded: Fe= 
91-87, Ni = 6.60, Co =: tr, P 1= .41 C, S, etc., = .54. A meteoric 
iron from La Bella Roca, a peak of the Sierra de San Francisco, Dur- 
ango, Mexico, has been described by Whitfield^* as containing little 
nodules of troilite. Those on the surface have been removed by 
weathering, leaving pits corresponding in size to the original nodules. 
-In a very exhaustive chemical article upon the meteoric iron of S. 
Juliao de Moreira, Portugal, E. Cohen^s has given some valuable 
analyses of this meteor, as well as of its constituents. He gives also 
new analyses of the Scottsville, Allen County, Kentucky, iron, and of 
that of Fort Duncan, Maverick County, Texas. A brecciated me- 
teorite from the San Emigdio Mountains, California, is described by 
'^''BuU. Soc. Franc, d. Min., 1889. XII., p. 76. 
" Min. Mag., Dec. 1887, p. 183. 
^ lb., p. 187. 
^ Pro. U. S. Nat. Mus.. X., p. 598. 
