1*16 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



15 mm. in diameter. On etching the iron no figures whatever are brought out, leaving only a minutely pitted light 

 gray surface which is more or less clouded. 



The only history of the finding of this siderite aa furnished by Prof. J. P. MacLean from the records of the Western 

 Reserve Historical Society, is as follows: 



"This meteorite was found in the fifties in central Missouri, and after being cut in halves one-half went to the 

 late Prof. Wm. Denton and the other half was purchased of Mrs. Newcomer (of Cleveland) by the late Judge C. C. 

 Baldwin and by him presented to the society." 



An analysis of this siderite (specific gravity, 7.5) by Mariner and Hoskins of Chicago gave: 



Fe Ni Co P S C 



94.734 4.62 1.18 1.442 1.015 1.009 =100.00 



The small amount of carbon is probably due to the fact that the portion of the mass used for analysis was free from 

 the black graphite-like veins. 



As no more definite locality can be traced aa the location in which this iron was found we will designate for this 

 iron the name Central Missouri. 



BIBLIOGRAPHY. 



1. 1900: PRESTON. Amer. Journ. Sci., 4th ser., vol. 9, p. 285. 



CHAMBORD. 



Lake St. John County, Quebec, Canada. 

 Latitude 48 35' N., longitude 73 8' W. 

 Iron. Medium octahedrite (Om) of Brezina. 

 Found 1904; described 1906. 

 Weight, 6.6 kgs. (13lbs.). 



This meteorite was described by Johnston l as follows : 



Some time during the season of 1904 a mass of iron was picked up in a field about 2 miles from the village of Cham- 

 bord (latitude 48 35' N., longitude 73 8' W.), county of Lake St. John, Province of Quebec. It was secured by Mr. 

 J. Obalski, superintendent of mines, Quebec, and by him kindly loaned to the Geological Survey Department for 

 purposes of examination. It is an irregularly shaped block having a length of 18.9 cm., a thickness of about 8.9 cm., 

 and a width varying from 10.1 cm. to 15.5 cm., and a weight of about 6.6 kg. The surface of the specimen haa unfor- 

 tunately to a considerable extent been marred by chisel and hammer marks made in attempts to cut up the iron. The 

 greater portion of the original crust has been scaled off by prolonged weathering and its place taken by a thin coating 

 of dark brown rust; that portion of the crust which is still remaining is smooth with a dull enamel-like luster and haa 

 brownish-black color; the surface is possessed of the usual pittings found on meteoric irons;* some of these are broad 

 and shallow while others again are small. A trough-like depression extends along one side of the specimen, the bed 

 of which is more or less jagged as if a piece had been detached during the meteorite's flight through the atmosphere. 

 Over a considerable area of the specimen a natural etching is visible, sometimes as coarse furrowings and at others as 

 minute ridges. Etching of a polished surface develops the Widmannstatten figures in moderately coarse outline, the 

 general design indicating an octahedral structure; this iron, therefore, belongs to the "Medium Octahedrites (Om)" of 

 Brezina's system of classification. Schreibersite appears in considerable abundance as very thin lamellae disposed 

 between the kamacite plates; in the trough-like depression previously referred to two small nodules of troilite are 

 exposed in section; they measure approximately 13 mm. in diameter and exhibit a series of fine parting lines running 

 in parallel position. This iron haa not yet been subjected to chemical analysis. 



BIBLIOGRAPHY. 



1. 1906: JOHNSTON. The Chambord meteorite. Ottawa Naturalist, June 4, 1906. 



CHARCAS. 



Santa Maria de los Charcas, San Luis Potosi, Mexico. 



Latitude 23 14' N., longitude 101 7' W. 



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



Mentioned 1804. 



Weight, 783 kga. (1,722 Ibs.). 



This meteorite was first described by Sonneschmid. 1 He states that it was a half-buried 

 block of native iron standing in the corner of a churchyard at Charcas. The part above the 

 surface was about 2.5 feet long and 1 foot thick. He says: 



It is said that the mass was brought from the neighborhood of San Jose 1 del Sitio, an estate 12 leagues distant, and 

 that in the same neighborhood several other masses have been seen firmly embedded in a limestone-like rock. 



