50 BULLETIN {M, UNITED STATES NATIONAL MUSEUM. 



Specific gravity of the iron at 23.4° C, 7.93 ; of the olivine at 23.2°, 

 3.376, according to Eakins. The proportional mineral composition 

 of the meteorites as a whole, as given by Winchell and Dodge, is as 

 follows : 



Per cent. 



Nickel-iron 74. 42 



Chromite 18.31 



Troilite 4.76 



Schreibersite -r 2. 13 



99.62 



Kiinz thought to have detected scales of graphite, and speaks of 

 the olivines leaving cavities highly polished, " showing even crystal 

 face Avith a mirror-like luster." In the United States National Mu- 

 seum's specimens nothing of the kind exists, the cavities being 

 smoothly rounded throughout. 



No. 154, gift of George F. Kunz; No. 161, of Robert Hay. 



References. — G. F. Kunz, On the group of meteorites recently dis- 

 covered in Brenham Township, Kiowa County, Kansas. Amer. 

 Journ. Sci., vol. 40, 1890, pp. 312-318. N. H. Winchell and J. A. 

 Dodge, The Brenham, Kiowa County, Kansas, meteorites. Amer. 

 Geologist, vols. 5 and 6, 1890, pp. 309 and 370. 



BURLINGTON, OTSEGO COUNTY, NEW YORK. No. 32. 



Iron, Om. Fragment weighing 76.87 grams ; one surface etched. 

 Weight of original mass not known, but reported to have been from 

 100 to 200 pounds (45 to 90 kilograms). Date of fall unknoAvn; 

 plowed up in field and put in hands of a country blacksmith, who 

 cut it up and made from portions articles for farmers' use. Analysis 

 by B. Silliman, jr., showed: 



Per cent. 



Metallic iron 92. 291 



Metallic nickel 8. 146 



100. 437 

 No other substances were detected. Specific gravity, 7.501. 

 Reference. — B. Silliman, jr., Amer. Journ. Sci., vol. 46, 1843-44, 

 p. 401. 



BUTLER, BATES COUNTY, MISSOURI. No. 96. 



Iron, Off. Section 7.5 by 5.5 by 1.1 cm. showing troilite nodules 

 and weighing 270 grams. From a mass weighing 36 kilograms, first 

 described in 1875. Analysis by J. L. Smith yielded: 



Per cent. 



Iron (Fe) 89.12 



Nickel (Ni) 10.02 



Cobalt (Co) .26 



Copper (Cu) .01 



Phosphorus (P) -12 



99.53 



