160 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



rhabdite, the latter reaching a length of 0.3 mm. and a breadth of 0.03 mm. According to information kindly given by 

 Doctor Farrington, the section in the Field Columbian Museum 75 sq. cm. in size, shows 3 small troilite inclusions 

 averaging about 2 mm. in diameter. 



Analysis by Dr. J. Fahrenhorst gave the following: 



Fe Ni Co Cu C Cr Cl PS 



85.99 13.4 0.70 0.03 0.03 0.02 0.02 0.06 0.00 =100.29 



This analysis shows chromium but not sulphur to be present. The chromium can not, therefore, be considered to 

 be present as daubreelite. Since a higher content of chlorine was found in the easily rusted portion a piece weighing 

 4.659 grams was used for a special determination. This showed 0.99 per cent of chlorine. 



The following mineralogical composition of the iron may thus be determined: 



Portion Portion 



rich in poor in 



chlorine. chlorine. 



Nickel iron 99. 57 97. 87 



Schreibereite 0. 39 0. 38 



Lawrencite... 0.04 1.75 



100. 00 100. 00 



The specific gravity was determined by Dr. Ziegler at 22 C. to be 7.4538. A medium content of iron chloride 

 (0.60 per cent) would give a calculated specific gravity for the nickel iron of 7.5443. This value is very low for an iron 

 so rich in nickel and probably indicates a porous structure in the easily rusted portion. Deep Springs stands by reason 

 of ite content of nickel and cobalt nearer the nickel-rich than the nickel-poor ataxites. Nevertheless it seems to me 

 better to group it with the latter on account of its structure and physical properties, which differ essentially from those 

 of the nickel-rich ataxites. 



The meteorite is chiefly (5,444 grams) in the possession of the North Carolina State Museum, 

 Raleigh, North Carolina. In addition, Ward has 738 grams, Chicago 420 grams, and Berlin 314 

 grams. 



BIBLIOGRAPHY. 



1. 1890: VENABLE. Two new meteoric irons. Amer. Joum. Sci., 3d ser., vol. 40, pp. 161-162. 



2. 1900: COHEN. Meteoreisenstudien XI. Ann. K. K. Naturhist. Hofmus., Wien, vol. 15, pp. 353-355. 



Dekalb County. See Smithville. 



DENTON COUNTY. 

 Texas. 



Latitude 33 12' N., longitude 97 10 7 W. approximately. 

 Iron. Medium octahedrite (Om) of Brezina; Caillite (type 18) of Meunier. 

 Known since 1856; described 1860. 

 Weight, 20 kgs. (40 Ibs.). 



This meteorite was first described by Shumard * as follows: 



Since writing the above the Texas State cabinet has been enriched with another mass of meteoric iron, somewhat 

 similar in composition to the Brazos specimen but of much smaller size. All that we have been able to gather of the 

 history of this meteorite is that it was picked up in Denton County, in the northern part of this State, and thence con- 

 veyed by the finder to McKinney, in Collin County, and presented to a blacksmith of that place, in whose possession it 

 remained for several months. In December last Mr. Higby, of McKinney, brought me a small hammered specimen 

 of this iron weighing 40 grains. He stated that the mass from which he had taken the specimen weighed about 40 

 pounds when it arrived in McKinney, but that the blacksmith had cut off several pieces, which he had wrought into 

 cane heads and various implements so that its original size had been much reduced. 



During last winter Dr. G. G. Shumard procured from the blacksmith a piece weighing 12 pounds 5.5 ounces, which, 

 after strict inquiry, was all that could be found of the original mass. 



This piece is of an irregular shape and appears to have formed the middle portion of an elongated mass, though in ita 

 present condition we can form no very definite opinion with regard to its original shape. The iron is remarkably close 

 textured and appears to be quite as malleable as the Brazos iron. Specific gravity, 7.6698. 

 The chemical composition, as determined by Prof. W. P. Elddell, is: 



Kesidue insoluble in NO 5 0. 32814 



Iron (mean of three determinations) 94. 02466 



Nickel 5.42982 



Cobalt.. Trace. 



99. 78262 



