248 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



filled with combs, comb heads, or bands, similar to kamacite in appearance. Dark fields free from combs seldom 

 occur. Troilite concretions occur with or without daubreelite bands. 



The meteorite is preserved almost entire in the Museum of the State Mining Bureau of 

 California. 



BIBLIOGRAPHY. 



1. 1880: Shepard. On the Ivanpah, California, meteoric iron. Amer. Journ. Sci., 3d ser., vol. 19, pp. 381-382. 



2. 1883-1884: Gehring. Mineral Resources of the United States. Washington, p. 290. 



3. 1891: Cohen and Weinschenk. Meteoreisen-Studien. Ann. K. K. Naturhist. Hofmus. Wien, Bd. 6, pp. 131, 



145 (analysis), 160, and 165. 



4. 1892: Cohen. Meteoreisen-Studien II. Idem, Bd. 7, pp. 149-150. 



5. 1895: Brezina. Wiener Sammlung, pp. 279-280. 



Ixtlahuaca. See Toluca. 



JACKSON COUNTY. 



Tennessee. 



Latitude 36° 25' N.; longitude 85° 40' W. 



Iron. Medium octahedrite (Om), of Brezina. 



Described 1846. 



Known existing weight 209 grams (15 ozs.). 



Troost * described this iron in 1846 from a piece weighing about 15 ounces, received from 

 S. Morgan and found in Jackson County, Tennessee. Any further details regarding the his- 

 tory, size, and place of discovery of the iron are unknown. The finder supposed it to be silver, 

 and accordingly kept the place of find secret,. 



Troost states that his piece was an accumulation of large crystals, some of an octahedral, 

 others of a tetrahedral form, of a very soft, malleable iron. The piece was accompanied by 

 crust fragments weighing 3& ounces. This was a hydroxide of iron of brown and yellow color, 

 penetrated occasionally with metallic iron and resembled, he states, the crust of the Sevier 

 County iron. The iron itself, however, he states, differs from the latter. 



Brezina 2 states that the iron is a medium octahedrite, but that the small quantity in pos- 

 session of the Vienna collection prevented further study. Wulfing, 3 probably on account of 

 Troost's mention of the similarity in crust, inquires whether this should be united with Cosby's 

 Creek (Troost's Sevier County), but the classifications differ and the localities are widely 

 separated. 



The small quantity known is distributed. 



BIBLIOGRAPHY. 



1. 1846: Troost. Description of three varieties of meteoric iron. — 2: Meteoric iron from Jackson County, Tennessee. 



Amer. Journ. Sci., 2d ser., vol. 2, p. 357. 



2. 1885: Brezina. Wiener Sammlung, pp. 211 and 234. 



3. 1897: Wulping. Die Meteoriten in Sammlungen, p. 163. 



Jalisco. See Tomatlan. 

 Jamaica. See Lucky Hill. 



JAMESTOWN. 



Stustman County, North Dakota. 

 Latitude 46° 56' N., longitude 98° 40' W. 

 Iron. Fine octahedrite (Of) of Brezina. 

 Found 1885; described 1890. 

 Weight, 4 kgs. (9 lbs.). 



This meteorite was first described by Huntington 1 as follows: 

 This meteoric iron was found in November or December, 1S85, during the construction of the James River Valley 

 branch of the Northern Pacific Railroad, about 15 or 20 miles southeast of Jamestown, Stutsman County, North 

 Dakota. 



