46 
masses have the form of rusty, porous nodules, and owing to alter- 
ation, much resemble certain varieties of limonite. Group of 
Canon Diablo, Arizona, siderites, the largest piece weighing 198.5 
pounds. Polished and etched specimens of the same. 100 pounds 
of the Kenton county, Kentucky, siderite. 
Case 2. — A large number of specimens of the Santa Catha- 
rina iron; etched specimens of the Joe Wright Mountain siderite; 
23 grams of the Lea iron, Tennessee; the Floyd Mountain, Virginia, 
iron. Specimens of the Butler, Mo., Dalton, Ga., Jenny’s Creek, 
Va., Welland, Canada, and many other siderites. 
Cases 3, 3 A and part of 4. — Aerolites. These are me- 
teorites made up largely of stony matter. The surface is usually 
black, smooth as if fused, and somewhat pitted. On breaking the 
thin, black crust which covers the exterior, the interior is generally 
found to be of a grayish color, with scattered metalliferous parti- 
cles. Analysis shows these meteorites to be made up largely of 
the silicates olivine, feldspar, augite and other minerals of the 
pyroxene group, and sulphides and phosphides of iron. 
Case 3 and part of 4. — The aerolite of earliest date is that 
from Ensisheim, Germany, which fell in 1492; 26 grams are shown. 
Other interesting specimens are 200 grams of the stone from 
L’Aigle, France; 7 grams of the Bishop ville. South Carolina, 
aerolite, remarkable for its light color and its composition of 
nearly pure enstatite; about fifty stones of the Pultusk, Poland, 
fall; fragments of the carbonaceous meteorite from Entre Rios, 
Argentine Republic; and two fragments of the recently discovered 
Beaver Creek, British Columbia, aerolite. 
Case 3A. — Six hundred and nine aerolites of the Winnebago 
county, Iowa, fall, varying in weight from a few grams to ten pounds 
each. These stones fell over an area nine miles in extent at 5:30 
p. M., May 2, 1890. They are each individually perfect aerolites. 
Case 3 A (West Side). — Large slabs of the Farmington, 
Kansas, aerolite, which fell June 25, 1890. Several masses of the 
Homestead, Iowa, aerolite. 
Case 3A (East Side) and part of Case 4 t.—Siderolites. 
These contain iron and stony matter in about equal proportions. 
Olivine is frequently found filling the cavities of the iron. 
They are illustrated by specimens of the Pallas iron, of the 
Rittersgrlin, Hainholz, Estherville, Rockwood, and many other 
siderolites. 
