O22 O20. Shepard on Meteoric Lrons in the U. States. 
As yet I have not been able to have any portion of the mass 
regularly slit and polished ; but a surface of one of the larger 
compound concretions, on being ground upon its broader side 
and polished, afforded me an area of half an inch square. 
This face, on being subjected to the action of dilute nitric acid, 
gave me a series of markings altogether new. They are ex- 
tremely fine and delicate in their dimensions, and require @ 
strong light with the aid of a microscope, to be seen with dis- 
tinctness. The first character that displays itself is somewhat 
that of a mesh or net-work, and arises from the polygonal 
boundaries of the granular concretions, The areas within these 
composed of plates of schreibersite. 
ae ‘5 6 
gen ; and leaves behind a slight residue of thin brilliant, 
blackish scales and needles. The following result was obtain 
on about two grams weight of the iron : 
4 
g--c 7 cee 3 
NS ea 94°580 
5 deisel ioeae ok eee 07129 
yes ete (523 
Magnesium, 
Calcium, "(4nd loss 1753 
Silicon, (?) 
