242 H. A. Ward — Billings Meteorite. 



traversed by irregular numbers of delicate plates seen only 

 under a lens, which run now in one and now in several direc- 

 tions. As a rule these plates start in great numbers from the 

 borders of the mesh and thin out toward the center, but in some 

 of the meshes they extend uniformly across. Several nodules of 

 troilite appear in the section examined and as usual occur near 

 its boundary. One of these nodules is irregularly oval in 

 shape and has a diameter of about one centimeter. The others 

 are smaller, and range in outline from nearly circular to con- 

 siderably elongated. None of them has a border of swathing 

 kamacite. A line of irregular parting extends across the sec- 

 tion, following roughly the lamellar planes, except at about the 

 middle of the section, where it runs nearly straight for a 

 distance of about 2 cm quite irrespective of the lamellar struc- 

 ture. The parting at this point has a width of about one 

 millimeter, and is filled with a substance of the section. This 

 substance shows a foliated structure parallel with the length of 

 the tsenite, others kamacite. The structure is evidently second- 

 ary in character and appears to be a filling subsequent to the 

 individualization of the main mass. 



The chemical analysis of the iron has been made by Mr. H. 

 "W. Nichols, the chemist of the Field Columbian Museum, and 

 is as given below: 



Analysis of Billings Iron 



Fe_. 91-99 



M 7-38 



Co 0-42 



Cu O'Ol 



Si 0-08 



P 0-15 



S 0-06 



100-09 



The larger part of this Billings siderite has taken its place 

 in the Ward-Coonley Collection of Meteorites. 



Chicago, Illinois. 



