GAY GULCH AND SKGOKUM METEORITES. 
S 
of troilite, with which is associated the white unidentified metallic 
substance to which attention has already been called, it presents 
only a microgranular structure in which the individual grains 
are barely discernible (Plate VII). Near the larger troilite in- 
clusions there is still presented the same microgranular struc- 
ture but the plate is marked by an abundance of small pittings, 
some nearly circular in outline, some narrow and elongated, and 
still others showing no definite form and all distributed appar- 
ently with regard to no definite system of arrangement (Plate 
X) . Distant from the troilite inclusions the etched plate pre- 
sents the same microgranular structure marked by pittings of the 
same kind as those observed in proximity to the troilite (Plate 
XI) , but here the pittings display some tendency to arrange them- 
selves in well defined directions parallel with the faces of the 
octahedron as in the case of Gay gulch ; the pittings are, however, 
much smaller than those observed in Gay gulch, but like them 
they are seen, when viewed obliquely, to be bounded by thin 
envelopes of a silver white metallic substance. Points and 
occasional lath-like forms of the same substance are also to be 
observed scattered over the surface. 
The Skookum iron has been analysed recently by Mr. J. 
E. Whitfield in the laboratory of Messrs. Booth, Garrett, and 
Blair, Philadelphia, Pa., and he reported it to have the following 
composition: 
Silicon 0 * 003 
Sulphur 0-002 
Phosphorus 0*194 
Manganese none 
Carbon 0*015 
Chromium 0*002 
Copper. none 
Nickel ...18*200 
Cobalt 0*910 
Iron. ,80*650 
99*976 
The specific gravity as determined by the author was found to be 7*561. 
