43 
HALL 62. 
riETEORITES. 
The collection of Meteorites includes over 200 ‘‘falls,’' or 
“finds,” represented by 4,077 specimens, which have an aggregate 
weight of 4,745.6 pounds. Besides these are sixty-three casts or 
models of notable meteorites. A complete catalogue of the collec- 
tion will soon be issued. The material at present exhibited has 
been collected by H. A. Ward, of Rochester, N. Y., and George F. 
Kunz, of New York City. In the arrangement of the collection 
the specimens are divided into three classes, viz.: Siderites, Sidero- 
lites, and Aerolites. Under each of these divisions the specimens 
are placed in chronological order, beginning with the earliest, and 
the labels show the locality, date of fall or find, and weight of 
specimen. 
Cases 1, lA, and 2. — Siderites y These are meteorites 
composed chiefly of iron, with varying percentages of nickel, and 
frequently cobalt and manganese. Combined sulphur and phos- 
phorus are also usually present. The surface of the siderites is 
smooth, as if fused, and more or less indented or pitted. Polished 
slabs, upon etching with nitric acid, usually show octahedral mark- 
ings called Widmannstatten figures. 
Case 1. — Specimens of earliest fall are irons from To- 
luca, Mexico, a meteorite found in 1784. Over twenty masses of 
this are shown, including polished slabs bearing the characteristic 
etching figures. 
Other interesting specimens are sections of the Zacatecas me- 
teorite, 72 grams; nearly 50 grams of the Cosby’s Creek, Tennes- 
see, iron; a large mass of the Signet iron, Tucson, Arizona, and a 
section of the Laurens County, South Carolina, siderite. 
Case lA. — Large masses of the Toluca, Mexico, iron; 
nearly 2,000 grams of the Bendego, Bahia, Brazil, siderite; 
L39^ grams of 'the Brazos River, Texas, siderite; specimens 
of the Butcher Iron, Coahuila, Mexico; natural and etched speci- 
mens of the Glorietta Mountain, New Mexico, iron. Large masses 
