37 
No, 71, — Same as above, without hatchures. 
No. 72, — Bacon’s library wall map of London and suburbs. 
No. 73. — Geological wall map of England and Wales. Scale, 
I in. equals 15 miles. 
No, 74, — Hotchkiss* geological wall map of Virginia and 
West Virginia. 
No 75, — Geological map of Russia. 
A complete series of the topographical maps issued by the U. 
S. Geological Survey is deposited in the Departmental Library, 
and can be examined on application to the Curator. 
Relief Map of the Moon. 
Alcove 103 . The relief map of the Moon, Alcove 103, is pro- 
perly an exhibit under this division. It is a model, in relief, of 
the visible hemisphere of the Moon, made on a horizontal scale of 
1:600,000 and vertical scale of 1:200,000. The hemisphere is 18 
feet in diameter. It is much the largest and most accurate work 
of the kind ever executed. 
The division of the moon’s surface into plains and mountain- 
ous regions is well illustrated also the great size and peculiar 
characters of the volcanoes. 
HALL 62. 
METEORITES. 
The collection of Meteorites includes 224 distinct “falls” or 
“finds” represented by 4,100 specimens, and having an aggregate 
weight of 4,720.6 pounds (2,140.4 kilograms.) 
These are grouped in three classes, viz. : — Siderites (iron 
meteorites), Siderolites (iron-stone meteorites) and Aerolites 
(stone meteorites.) 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. 
Case 1, — Siderites, These are meteorites composed chiefly 
of iron, with varying percentages of nickel, cobalt, manganese, 
etc. Combined sulphur and phosphorus are usually present. The 
