268 
The American Geologist. 
November, 189& 
The following figure, (fig. 1) reduced to one- third the nat- 
ural size, shows the shape of this iron, and the average thick- 
ness is about ^ inch. The upper (convex) surface is tolerably 
smooth, but has an indistinct, pock-marked aspect, due appa- 
rently to an internal crystalline structure, or to variation in the 
relative amounts of the ingredients. The lower surface, which 
is about a plane, is, however, curiously pitted and rough. 
Some of the pits are so deep as to nearly pierce the specimen. 
They are smooth, and conico-thimble shaped. This surface 
has, moreover, a thin scale, or rust, which suggests a mete- 
FlG. 1. 
