’ 
Phenomenom.in Hamatite.— Gresley. 223 
procured, might throw light on the subject. The general aspect 
of this singular variety of ore of iron, so strangely resembling 
split wood, suggests the name of ‘‘ Wood fron-ore” for it, but the 
. grain in wood passes around knots, or holes once occupied by 
knots, in a different way from the grain in this iron-ore. 
The specimen in question can in no way be regarded as psev- 
domorphous, or be a replacement formation after limestone, dolo- 
mite, pyrite, chalcedony, etc., nor is it a foss/7 (mineralized wood) 
or anything of that description. 
ime enn. U.S. A:, Nov., 1891. 
ERIE, Pa., Dec. 15, 1891. 
Pror. N. H. WINCHELL. 
Dear Srr: Acting on your suggestion, I have polished one end of 
the sample through one of the holes, and beg to inclose drawing and de- 
scription. I cannot see anything here attributable to wood-tissuc. The 
dull-polishing portions, cc, are the sides or walls of the hollow aba, 
and may be insusceptible of taking a higher polish because the fibres of 
the ore here are bent in the direction of the hole, as you will notice in 
the photo (plate V). 
Enlarged view of polished transverse section taken through, or on the plane of one of 
_ the tunnels or empty holes of this ore. 
The hole lies between aa, the portion left on the specimen being 
about 54; inch deep in the center, as at ?. This portion (a to @) is, there- 
fore, not polished; ¢ ¢ are the two walls of the hole, the ore of which does 
not take a good polish. This part of the ore exhibits harder and brighter 
spots, d d, which gradually merge into the compact, hard ore, « e, (the 
unshaded portion of the surface treated), which takes a high polish. 
The surface of the hole (a to w) is, as shown, slightly mammillated and 
coated with red, powdery ore. W. S. GRESLEY. 
