122 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



since there is no indication of an opening produced by the dislocation. Only on some sections are the needles oriented 

 according to two perpendicular directions. Another part of the nickel-iron phosphide is quite irregularly bounded, 

 and the lumpy-shaped individuals are united to hieroglyphic groups. Besides the nodules mentioned by Shepard 

 and Reichenbach of measurable compass and, as it seems, of rare distribution, there occur also little troilite particles 

 surrounded by a small zone of schreibersite. Leick has tested Chesterville according to the methods employed by 

 him in his work on the Magnetic Relations of Galvanic Iron, Nickel, and Cobalt Precipitates. It exhibited the prop- 

 erties both of steel and cast iron. Like the former, it took on permanent magnetism which by strong jarring was little 

 weakened. On the other hand, in the magnetic spiral it behaved like cast iron, although the temporary magnetism 

 was only one-fifth to one-fourth as strong as in the latter. Qualitatively, it showed the same properties as the elec- 

 trolytically precipitated nickel-iron alloys. The specific magnetism was determined as 0.14 absolute units per gram; 

 the polar magnetism was not determinable. 

 Analyses by Sjostrom 10 . : 



Fe Ni Co Cu Cr C P S 



93.15 5.82 0.73 0.34 .... =100.04 



93.80 5.50 .75 0.02 Trace. 0.02 .34 0.03 =100.46 



94.25 5.03 .68 .02 Trace. .02 ="100.00 



Mineralogical composition: 



Nickel iron 97. 72 



Schreibersite .*. 2. 20 



Iron sulphide 08 



100.00 



Specific gravity (Leick) 7.8209 to 7.8737. 



Relative to the arrangement of rhabdite and chemical composition single portions of the meteorite seem to behave 

 differently. The swollen appearance of etched faces makes Chesterville resemble the Siratik group, but it differs 

 from the latter by the lack of the characteristic depressions, and in the arrangement of the rhabditee, on which Brezina 

 lays great weight, Chesterville resembles the hexahedrites. Although it may be true, as seems here and there to be 

 evident, that these are arranged according to the faces of the cube, this need not be decisive for the classification any 

 more than the hexahedral orientation of the Reichenbach lamellae in the octahedrites. If one should consider the 

 latter as deciding the structure of the main mass of the nickel-iron, then they must apply this rule to all irons which 

 consist of grains without octahedral structure and without Neumann lines. 



The meteorite is distributed. London possesses 2,250 grams, New Haven 758, and 

 Vienna 81. 



BIBLIOGRAPHY. 



1. 1849: SHEPARD. On meteoric iron in South Carolina. Araer. Journ. Sci., 2d ser., vol. 7, pp. 449-450. 



2. 1852: WOHLEE. "Activ". Pogg. Ann. Bd. 85, p. 448. 



3. 1852: CLARK. Dissert. Gottingen, pp. 66-67. 



4. 1859-1862: VON REICHENBACH. No. 9, pp. 162, 175, 176, and 182; No. 12, p. 457; No. 15, p. 100; No. 17, p. 273; 



No. 18, pp. 482, 487, 488; No. 19, p. 155; No. 20, pp. 621, 622. 



5. 1863: ROSE. Meteoriten, p. 69. 



6. 1884: MEUNIER. Meteorites, p. 112. 



7. 1885: BREZINA. Wiener Sammlung, pp. 203 and 219. 



8. 1893: MEUNIER. Revision des fers m6t6oriques, pp. 15 and 18. 



9. 1895: BREZINA. Wiener Sammlung, p. 294. 



10. 1897: COHEN. Meteoreisen studien V, pp. 46-47. 



11. 1898: COHEN. Meteoreisen studien VIII, pp. 148-150. 



12. 1905: COHEN. Meteoriten kunde, Heft 3, pp. 62-66. 



CHILKOOT. 



Chilkoot Inlet, Portage Bay, Alaska. 



Here also Chilkat. * 



Latitude 59 2(X N., longitude 136 W. 



Iron. Medium octahedrite (Om) of Brezina. 



Mentioned 1881. 



Weight, 43 kgs. (94 Ibs.). 



This iron, according to the account of the State Mining Bureau, 1 was obtained from the 

 locality above indicated in June, 1881, by the State Mining Bureau of California. It was pur- 

 chased, it is stated, from Chief "Donawack" or "Silver Eye," who said that it had been seen to 



