Refuge 



An area designated for the maintenance of animals 

 within which hunting or fishing is prohibited or strictly 

 controlled, cf. Natural area. 



Refugium 



An area that has not been exposed to great changes under- 

 gone by the region as a whole, and as a result provided 

 conditions suitable for the survival of Relic (q. v.) species, 

 cf. Nunatak. 



Reg 



Parts of the Sahara desert with a gravelly or stony surface 

 because the fine materials have been blown away. 



Regeneration 



The process occurring in some animals by which a part 

 of the body which has been lost may be restored, e.g., a 

 crayfish growing a new appendage, growth of new tissue in 

 the wound of a mammal. 



Regional Climax 



See Climatic Climax. 



Regionalism 



The concept of the integration of relations in human 

 society to the particular conditions and resources that obtain 

 in a region such as the Columbia River basin or the northern 

 Great Plains. 



Regolith 



The unconsolidated mantle of soil material and weathered 

 rock on the surface of the earth. 



Regosol 



A deep soil consisting of loose material without stones 

 and shows only slight development of a Profile (q. v.). 



289 



