10 THE LEWIS BROOKS MUSEUM. 



Class 8. — Ores of Silver. — This class contains speci- 

 mens of native silver, horn silver, and the various sulphides 

 containing silver, from numerous localities. 



Section III. — Stratigraphical Geology. — The rocks that 

 characterize the various stratified formations, fossiliferous or 

 not, are here arranged in chronological order. In the rep- 

 resentation of the several fossiliferous beds, some of the 

 specimens exhibit the more common and characteristic forms 

 of animal and vegetable life. About 600 specimens are 

 here included, and about one-half of them are selected to 

 give a comprehensive view of the lithological peculiarities of 

 the rocks of various formations of the Old and New Worlds. 



The remainder of the section consists of a few local or 

 geographical series of rocks, which represent to a certain 

 extent the geology of some remarkable regions of varied 

 geological constitution. 



Series 1. — This consists of about 100 specimens, and 

 represents the metamorphic strata of the region around Mt. 

 Blanc. 



Series 2. — Contains about 200 specimens, and repre- 

 sents the Paleozoic rocks of the New York system. 



Series 3. — Contains 100 specimens, and represents the 

 Deculiar formation of the Paris Basin, with its alternating 

 salt and fresh-water deposits. 



Series 4. — Represents by about 100 specimens the vol- 

 canic rocks of Mt. Vesuvius. 



Series 5. — Is composed of the numerous and diversified 

 rocks that form the volcanic region of Central France. 



Series 6. — Represents by a suite of about 100 specimens 

 the typical rocks of Saxony. 



Section 4. — Phenominal Geology. — The specimens of 

 this section, about 500 in number, illustrate many interest- 

 ing points in dynamical and physical geology, and many of 

 the phenomena of rock formation and modification under the 

 action of physical forces. 



