on certain stony and metalline Substances , 6cc. 
native iron from Siberia, and that from Bohemia, were also 
mixed with nickel. Mr. Howard, consequently, lost no time in 
proceeding upon this important investigation. The native iron 
of Siberia presents some very interesting peculiarities, and has 
often been referred to, but has not yet been properly described ; 
it is therefore with great pleasure that I add the following 
description of it, and of some other kinds of native iron, to the 
description I have already given of the various stones said to 
have fallen on the earth. 
I feel the greater satisfaction in doing this, as the noble col- 
lection of Mr. Greville contains two specimens of this iron, 
m perfect condition ; one of which weighs several pounds, and 
was sent to Mr. Greville by Mr. Pallas himself: on this 
account, therefore, I enjoy an advantage that many of the authors 
who have spoken of this iron probably wanted. 
One of these pieces has a cellular and ramified texture, ana- 
logous to that of some very porous amd light volcanic scoria : 
this is the usual texture of the specimens of this kind of iron, 
which are preserved in the various mineralogical collections in 
Europe. When it is attentively examined, there may be per- 
ceived in it, not only empty cells, but also impressions or cavities, 
of greater or less depth, and sometimes perfectly round, which 
appear evidently to be the result of the compression of hard 
bodies, which were situated there, and which, when they came 
away, left the surface of these cavities quite smooth, and having 
the lustre of polished metal. Here and there, in some of these 
cavities, there remains a transparent substance, of a yellowish 
green colour, of which I shall treat more particularly, when I 
come to the description of the second of the specimens above 
mentioned. It is very clear, that the cavities here spoken of 
