314 FieLp CoLumBian MuseEumM—GEo Locy, VoL. I. 
masses is a further point of difference. It seems impossible at pres- 
ent therefore to connect the Hopewell Mounds mass with any known 
meteorite and the specimen,will therefore be designated as the Hope- 
well Mounds meteorite. 
TAENITE FROM THE KENTON COUNTY METEORITE. 
One of the sections of the Kenton County, Kentucky, meteorite 
in the Museum collection (Museum No. Me. 134), tends to decompose 
along the planes of structure marked by the Widmanstatten figures. 
The result of this decomposition is a separation of the mass into frag- 
ments bounded by octahedral planes, of a homogeneous alloy of iron- 
gray color between which lie thin, elastic plates of a tin-white color. 
The first alloy is undoubtedly kamacite, the second taenite. In order 
to compare this taenite with that known from other meteorites, some 
study of it was made. The fragments which it was possible to sepa- 
rate rarely exceeded four square millimeters in surface. As plates, 
they were thin, elastic and magnetic. The only feature noted regarding 
their surface was that it is often marked by parallel rows of minute 
ridges extending across the plate. Corresponding striations usually — 
appear on the adjacent kamacite. The plates are soluble in copper 
ammonium chloride, and fusible with difficulty B.B. 
In separating plates for analysis care was taken to use only those 
which could be completely isolated and showed no rust. This proved 
a laborious operation, and after considerable toil the amount that 
could be secured for analysis was only 0.022 grams. The analysis 
was made by Mr. H. W. Nichols. Iron was determined by titration 
with an n/1oo potassium bichromate solution, and cobalt and nickel 
isolated by means of two ammonia and three basic acetate separations 
and then precipitated electrolytically. 
While the extremely small amount used for analysis makes the 
chances of error larger than is desirable, it is believed that fairly 
accurate results were attained. 
The analysis gave: 
Fe : : : : ; : 80.3 
Niwand'Co..; ; ; : é ; ; ; 19.6 

99:9 
