17 
DEPARXriENT OF GEOLOGY. 
The collections gathered in the Department of Geology are 
designed to illustrate the history of the earth's development 
and the materials which form its crust. 
Since, moreover, the science of geology has both a the- 
oretical and a practical side, a division of the collections has 
been made in order to present these two phases of the sub- 
ject. Those illustrating geology as a theoretical science are to 
be found in the Division of Systematic Geology; those show- 
ing it more particularly in its relations to human arts and in- 
dustries, in the Division of Economic Geology. 
DIVISION OF SYSTEMATIC GEOLOGY. 
This division comprises six sections, located as follows L 
Paleontology : Alcove 103, Halls 35, 36, 59, 60 and 6L 
Meteorites : Hall 62. 
Systematic Mineralogy: Halls 63 and 64. 
Structural and Dynamical Geology: Hall 65. 
Lithology : Hall 66. 
Geographic Geology: Halls 76 and 77. 
These sections may be considered as illustrating, first, the 
life of the globe from its earliest beginnings to its latest and 
highest forms; second, the bodies which come to us from reg- 
ions outside the earth and which furnish the only materia! 
sources from which we can learn the composition and struc- 
ture of the heavenly bodies; third, the component minerals of 
the earth's crust, classified according to their chemical compo- 
sition; fourth, the aggregates of these into rocks; fifth, the ef- 
fects produced by physical forces in forming and shaping the^ 
materials of the crust, and sixth the configuration and mode of 
formation of the surface of the earth. 
