THE FREDA METEORITE—-HENDERSON AND PERRY 23 
Plate 2, figure 2, displays the fusion crust and its invasion into the 
meteorite. 
Plate 3, figure 1, shows the kamacite bodies at moderate magnifica- 
tion and very lightly etched. There is a trace of octahedral orienta- 
tion, and in place of the narrow taenite borders usually seen around 
needles of kamacite in nickel-rich ataxites there is a wider zone. 
Plate 3, figure 2, illustrates the invasion of oxide into particles of 
kamacite, which contains phosphide inclusions. 
Plate 4, figure 1, shows martensiticlike structures with a kamacite 
body containing two rounded inclusions of iron-phosphide eutectic. 
The eutectic contains minute clear droplets of rejected iron. 
Plate 4, figure 2, is lightly etched with picral solution and then 
sodium picrate, which blackens the phosphide inclusions. These in- 
clusions, formed by absorption of iron from the surrounding mass, 
on cooling rejected the excess of iron above the iron-phosphide eutectic 
ratio, which formed minute clear droplets. Some phosphide also 
appears distributed in the kamacite. 
Classification—The Freda meteorite belongs to the nickel-rich 
ataxite group, there being only four meteorites now known with 
higher nickel percentages. In table 1 these end members of the nickel- 
rich ataxite group are arranged in order of their increasing nickel 
content. There are reasons to suspect that the nickel contents of the 
four meteorites richer in nickel than the Freda specimen may not be 
accurately determined. The old analyses are given for qualitative 
comparison. However, there is sufficient unpublished metallographic 
evidence on file to show that the Freda has a metallographic structure 
similar to the four meteorites that probably have higher nickel 
contents. ; 
