104 GENERAL ARRANGEMENT. 



accurately determining the correspondence in age of forma- 

 tions occurring in distant parts of the earth's surface ; hence 

 a large and varied palseontological collection, such as that of 

 the British Museum, is best arranged in the main upon a 

 systematic or zoological and botanical basis. A limited series 

 showing the more characteristic rock-formations with their 

 included fossil remains, of the British Isles, placed in chrono- 

 logical sequence, is arranged in one of the galleries of the 

 Geological Department. 



