45 
HALL 62 . 
flETEORITES. 
The collection of Meteorites includes 180 distinct “ falls ” or 
“ finds ” represented by 4,077 specimens, and having an aggregate 
weight of 4,720.6 pounds; 2,140.4 kilograms. 
These are grouped in three classes, viz.: — Aerosiderites or 
Siderites, Aerosiderolites or Siderolites and Aerolites. Under 
each of these divisions the specimens are placed in chronological 
order, and labels show the locality, date of fall or find, and weight 
of specimen. 
Cases 1, 1A, and 2. — Siderites . These are meteorites 
composed chiefly of iron, with varying percentages of nickel, 
cobalt, manganese, etc. Combined sulphur and phosphorus are 
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 markings called 
Widmannstdtten figures. 
Case 1 .— Among specimens of earliest fall are irons from 
Toluca, Mexico, a meteorite found in 1784. Over twenty masses 
cf this are shown, including polished slabs bearing the character- 
istic etching figures. 
Other interesting specimens of meteorites are those from 
Magura, Szlanicza, Hungary; Coney Fork, Tenn.; Braunau, Bo- 
hemia; Seneca Falls, N. Y.; and Lion River, South Africa. 
The Widmannstatten figures are beautifully shown on the 
latter, and many other specimens in this case. 
Case 1 A. — Large masses of the ToLuca, Mexico, iron ; 
nearly 2.000 grams of the Bendego, Bahia, Brazil, siderite ; 
1,396 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 
of the peculiar meteorite from Santa Catharina, Brazil. These 
