254 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



Calculation from the data furnished by the analyses shows that the mineralogical composition of the stone is 



approximately: 



Nickel iron 4. 3 



Troilite 5. 2 



Chromite , 0. 9 



Schreibersite? 0. 8 



Olivine 30. 2 



Bronzite 23. 6 



Pyroxene 5.0 



Oligoclase (Ab 5 An,) 6. 6 



Orthoclase 1.6 



Limonite 20. 2 



Nickel oxide 1. 6 



100.0 



In the above, all the phosphorus is assumed to exist as schreibersite, soda and potash to belong to the feldspars, 

 and the NiO to be the product of the oxidation of the nickel iron. It will be evident that if, as seems certain from 

 the microscopic examination, the limonite is derived entirely from the metallic iron, the amount of metallic Fe 

 originally present was higher by some 12 per cent, and the nickel higher by 1.25 per cent. The nickel iron present in 

 the fresh stone would then have amounted to about 17.50. That the orthorhombic pyroxene is bronzite rather than 

 enstatite is shown by its calculated composition, which is — 



SiOo 56. 8 



MgO 32. 6 



FeO 10. 6 



100.0 



The pyroxene is largely diopside, with less than 10 per cent of the aluminous augite molecule. The plagioclase 

 is an oligoclase of the composition AbjAn^ The orthoclase molecule probably also belongs with it, in which case it 

 must have about the composition AbsOrjAn!. 



On the whole the stone seems to belong to a rather widespread group, and does not differ essentially from several 

 that have been recently described from this continent, e. g., the Salt Lake City, the Bluff, the Beaver Creek, and the 

 Washington, Kansas, meteorites. 



Preston 3 suggested that this stone might belong to the same fall as Long Island and 

 Prairie Dog Creek, but Farrington 4 concluded from a study of the structure that it was prob- 

 ably a distinct fall. Berwerth 5 included Jerome under Prairie Dog Creek. Brezina fl classed 

 the meteorite as a spherulitic crystalline chondrite. 



The meteorite is chiefly pieserved in the Yale University collection. 



BIBLIOGRAPHY. 



1. 1897: Dana. Yale Alumni Weekly, May 6. 



2. 1898: Washington. Amer. Journ. Sci., 4th ser., vol. 5, pp. 447-154. 



3. 1900: Preston. Idem, vol. 9, p. 412. 



4. 1902: Farrington. Meteorite studies I. Publ. Field Columbian Mus., Geol. ser., vol. 1, pp. 302-305. 



5. 1903: Berwerth. Wiener Sammlung, p. 5. 



6. 1904: Brezina. Catalogue of the Ward-Coonley Collection, p. 100. 



JEWELL HILL. 



Madison County, North Carolina. 



Here also Jewel Hill. 



Latitude 35° 32' N., longitude 82° 28' W. 



Iron. Fine octahedrite (Of), of Brezina; Jewellite (type 9), of Meunier. 



Found 1854 and 1856; described 1876. 



Weight, two masses of 18 and 3§ kgs. (40 and 7 lbs.). 



The history and characters of this meteorite have been summarized by Cohen u as follows: 



According to Venable, 10 the county seat of Madison County was formerly called "Jewell Hill"; and the name 

 was later changed to Duel Hill. Three masses were said to have been found there, two of which were described 

 briefly; namely, a mass weighing 3§ kg., found in 1854 and described by Smith, 1 and a block of IS kg. weight found in 

 1856 of which 787 grains found their way into the Amherst College collection. Burton, however, described in 1876 



