THE LEWIS BKOOKS MUSEUM. 7 



copper, lead, silver, gold, nickel, cobalt, bismuth, antimony, 

 arsenic, &c, &c, and contains many rare minerals. 



Class 6. — Resins. — This contains such minerals as am- 

 ber, bitumen, mellite, &c. 



Besides the specimens of the actual minerals, the col- 

 lection contains fac similes in glass of all the notable Crown 

 Diamonds. It also contains representations in colored glass 

 of the natural crystal forms of the various precious stones, 

 the glass imitations being colored with the proper color of 

 the minerals imitated. 



Many of the mineral species in the collection are ac- 

 companied by wooden models of the characteristic crystal 

 forms in which the species crystalizes. This is a most use- 

 ful feature. The collection also contains fac similes of the 

 largest nuggets of gold which have been found in various 

 countries. 



CABINET OF GEOLOGY. 



This department is divided into I. Geology Proper , and 

 II. Paleontology. 



Division I. — Geology Proper. 



The specimens, about 2,000 ia number, illustrating this 

 division, are separated into four sections, as follows : 



Section I. — Lithology. — In this collection all the known 

 kinds of rocks are represented by about 600 specimens. The 

 classification is, to a very considerable extent, that of the 

 late Professor Cordier, of Paris, and the one followed in the 

 arrangement of the Rock-Coliections of the Garden of Plants. 

 This is, however, much modified to accord with more recent 

 investigations in the science in France and Germany. It is 

 based upon both mineral composition and origin, or form of 

 aggregation, without reference to geological age. The 

 smaller specimens are dressed to a uniform size, and each 

 specimen is mounted upon a separate block, h^viug a print* 

 ed label supported by a brass holder* 



