126 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



CINCINNATI. 



Old collection in Cincinnati, Ohio. 

 Latitude 39° 7' N., longitude 84° 29' W. 

 Iron. Ataxite, Siratik Group (Ds) of Brezina. 

 Found 1898; described 1898. 

 Weight: Only 28 grams known. 



The first mention of this meteorite occurs in Wulfing's catalogue ' where he states that the 

 following was communicated to him by Weinschenk: 



The Cincinnati iron was presented to the Munich Institute by Hosaeus, who possessed a section of considerable 

 size and was in doubt as to its meteoric character. The iron had a tolerably high percentage of nickel, was quite thick, 

 and showed small shiny rods; its meteoric character seems doubtful to me. It is said to have been found near a 

 dwelling house in Cincinnati, Ohio. 



Dr. Weinschenk later placed at the disposal of Professor Cohen, for investigation, a piece 

 weighing 28 grams and having a section surface of 6.5 sq. cm. Cohen 2 describes this as follows: 



The iron behaved, upon etching, quite like that of Campo del Cielo and Siratik. After exposure for a short time 

 to the action of nitric acid a few small glistening grains appear, while the groundmass remains shiny and even. Under 

 the microscope one can discern very fine furrows which seem to consist of grains 0.02 to 0.2 mm. in size, which reflect 

 the light simultaneously. By stronger etching the grains increase and depressions resembling indentations appear; 

 the number of both is distinctly small, however. Moreover the iron does not behave the same over the entire section 

 surface. About two-thirds of the surface takes on a puffy-rough character like that of Campo del Cielo, with a distinctly 

 parallel arrangement of the puffy eminences; on the other portion, which does not show so many large grains or inden- 

 tations, a distinctly granular structure appears, like that which Siratik shows, with about the same degree of etching. 

 The individuals, sharply separated from one another, are isometric in the larger specimens, but in the smaller they are 

 variously bent and indented; the larger number at all events reflect the light simultaneously. 



The nature of the large grains and the depressions resembling incisions formed by stronger etching can not be 

 determined with certainty here any more than in the case of the other two mentioned meteoric irons. I think it prob- 

 able, however, that the grains are formed by lamellae of troilite covered with a thin pellicle of nickel-iron which protects 

 the lamellae of troilite against the action of the acid for a time; when this thin coating of nickel-iron is eaten away, 

 however, then the lamella? of troilite are dissolved out and leave depressions of the form of the lamellae. 



Of accessory constituents only a few irregularly formed particles of schreibersite were observed in one place. 



Analysis (Sjostrom): 



Fe Ni Co Cu P S 



94.47 5.43 0.68 0.01 0.05 0.05 =100.69 



Specific gravity (Leick) 7.6895. The specific magnetism per gram as determined by Leick was 0.44. Permanent 

 magnetism weak. 



Since the Cincinnati meteorite does not correspond exactly with either that of Campo del Cielo or Siratik there 

 appears to be no occasion for supposing a confusion on the part of Hosaeus to which view one might readily enough be 

 inclined by a cursory examination of the Cincinnati iron. On the other hand, since I had but one piece of each of the 

 three meteorites at hand for comparison, other portions of the Campo del Cielo and Siratik irons may after all show 

 similar structural differences to those of Cincinnati. 



If Cincinnati be regarded as an independent fall, then it forms, with Siratik and Campo del Cielo, a well-defined 

 group of ataxites poor in nickel, which is distinguished by puffy grains and depressions resembling incisions, and 

 whose representatives possess nearly the same chemical composition. 



Only a small quantity of the iron is known. Minod in Genf is said to possess a large piece. 

 Munich has 28 grams. 



BIBLIOGRAPHY. 



1. 1897: Wulfing. Die Meteoriten in Sammlungen, p. 399. 



2. 1898: Cohen. Uber das Meteoreisen von Cincinnati. Ber. Berlin Akad., pp. 428-430. 



3. 1905: Cohen. Meteoritenkunde, Heft 3, pp. 52-53. 



Claiborne. See Limestone Creek. 



Claiborne, 1853. See Tazewell. 



Clarke County. See Limestone Creek. 



Claywater. See Vernon County. 

 Cleburne County. See Chulafinee. 



