308 FIELD COLUMBIAN MusEuM—GEOLOoGy, VOL. I. 
The analysis gave the following results: 

Fe : : ; ; : , . ; 90.56 
Ni ) : : : rae! 
Co ; 4 : J : 1.07 
Cu ; ; E ; i : ‘ ; : ; 0.14 
Mn ‘ : : : : ‘ . : ! ; Trace 
iid . ; : f , : ; : ‘ : . 0.24 
e 2 : ‘ : ; / : 4 : ; 0.01 
S ee : : : ‘ 0.025 
se) ; : F ; : 0.006 
Insol. . ; ; , : 7 : ; ; 0.09 
99.85 
Omitting silicon and insoluble matter the analysis indicates that 
the meteorite has the following mineralogical composition: 

Nickel-iron (Fe, Ni, Co, Cu, Mn.) . : : : 97.98 i 
SCHTeipersite was ; ; : : : ; . 1.55 
Cohenite. ; é : ; 0.15 
Troilite ; ; ; : ; 0.07 
99.75 
As the locality where the meteorite was found may be said in a 
certain sense to be in the vicinity of Toluca, it becomes an important 
question from the standpoint of the collector to determine whether 
the specimen is to be regarded a portion of the Toluca fall. Los 
Reyes is about forty miles (sixty-two kilometers) in a direct line east 
of Toluca. It is the little station at the southern end of Lake Tex- 
coco where the Morelos division of the Interoceanic Railway joins 
the main line, about twelve miles southeast of the City of Mexico. 
On the same line of railroad twenty-five miles from the City of Mex- 
ico is the town of Ameca-Ameca, where the find of another iron mete- 
orite has been reported by Castillo.* Castillo classes this iron with 
the Toluca meteorites,t and describes the ‘‘zone” of Toluca mete- 
orites as extending from Ameca-Ameca on the east to Xiquipilco in 
the valley of Toluca [on the west]. If Castillo is right in this conclu- 
sion the Los Keyes meteorite comes within this zone, as Los Reyes 
is some fifteen miles (twenty-three kilometers) nearer Toluca than 
Ameca-Ameca. Castillo unfortunately gives no description of the 
Ameca-Ameca meteorite by which its resemblance or otherwise to 
the known specimens from Toluca can be determined. He simply 
describes it as a ‘‘small nodule of meteoric iron found in the village [of 

*Catalogue Descriptif des Meteorites du Mexique, Paris, 1889, p. 3. 
TOP. Cit Dalte 
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