MARCH, 1907; Iron METEORITES — FARRINGTON. 97 
subdivisions may be made of the ataxites, according as they are nickel- 
poor ornickel-rich. Transitions occur between these, but a general 
_ grouping is practicable. Accessory constituents are not usually abun- 
dant in the ataxites, and when occurring are of small dimensions as a 
rule. 
A. NICKEL-POOR ATAXITES. 
The nickel-cobalt content hes between 6 and 7 per cent, the com- 
position thus corresponding to that of kamacite. The structure is, 
-asarule, plainly granular, seldom compact, the size of the grains 
reaching 0.75 mm. 
Peso kA TksGROUPS 
An etched surface appears rough through the presence of irregu- 
larly arranged depressions, due perhaps to the solution of some acces- 
sory constituent, such as troilite or schreibersite. The smaller the 
depressions the more plainly the boundaries of the grains appear. 
The latter range from 0.33 to 0.75 mm. in dimension. 

$—$—$—$—_$—__—__——_ 
wBeeeee 
me 2 8 0 6 
eee ow 
Total. Sp. Gr. Analyst. Reference. 
foos1o) 7.547. (N.S; Manross.....4 Veen, An J ,.90(2)X. Vy 22 
99.23] * <7.35 Ae eav ea ELAS raierete toons Ann. Chem. u. Pharm., CXV, 92 
four2e@e 7.7079 10. 9jostrom:...-..... SD een MILT. Ave NO- Ely 
100.69} 7.6895 a a eae ee 1898, Ber. Berlin Akad., 428-430 
100.77| 7.7083 rn ag) = so nen oe 1897, Ber. Berlin Akad., 76-81 
99.89 7.83 Reet, Wamoit ©). %..5'3 1868, Comptes Rendus, LXVI, 573-574 
100.03} 7.7687 .|J. Fahrenhorst ..... 1goo, Meteoreisen-Studien, XI, A. N. H., XV, 
fomaater 7.7752. 10. SJOStrom? vi), 5.5% ce te leeageh Studion Vili> Ae No He 
ALI. L35 
