GEOLOGY 



The Geological material is assembled in two collec- 

 tions, the one arranged according to the scientific, 

 the other according to the economic or industrial 

 standpoint. The scientific classification is that usually 

 followed in school and college text books. The eco- 

 nomic arrangement, on the other hand, groups the 

 materials, irrespective of their scientific order, accord- 

 ing to the uses to which they are put. 



The first portion of the collection is the mineral 

 group which is classified according to Dana's order. 

 Then follows the W. J. Chalmers crystal collection 

 showing the different forms o the crystallization of 

 minerals. The meteorite collection which comes next 

 is the largest in the world and contains examples of 

 more than half of the known meteorites. 



The physical geology section illustrates the struc- 

 ture of the earth's surface and the effects of the various 

 natural forces on the materials of which the earth is 

 composed. 



The rock collection is very extensive, consisting of 

 specimens of uniform size, grouped according to kind 

 and composition. 



Geographic geology is illustrated by means of some 

 sixty relief maps and models, which include represen- 

 tations such as the Yosemite Valley, Niagara Falls, the 

 Grand Canyon and the Natural Bridge of Virginia. 



In the section of Historical Geology, the develop- 

 ment of life on earth from the age of the simplest 

 invertebrates to that of man is followed in historical 

 sequence. 



The economic exhibits in Frederick J. V. Skiff 

 Hall consist of collections of the ores of precious and 



Page Twenty-three 



