Aureomycin 



The Antibiotic formed by the mold Streptomyces 

 aureofaciens. 



Auroral 



Refers to the dawn or the morning Crepuscular period. 



Austral Life-zone 



One of Merriam's life-zones comprising most of non- 

 montane United States and Mexico, bounded on the north 

 by a growing season of accumulation of 1 0,000 F. above 43 F. 

 and on the south by 26,000 F., with a mean daily tempera- 

 ture of 64.4 F. during the six hottest weeks at the northern 

 limit. 



Australian Region 



The faunal region comprising Australia and New Guinea, 

 with Tasmania and smaller islands, in the realm Notogea 

 (q. v.). 



Austroriparian Life-zone 



A subdivision of the Lower Austral life-zone, east of the 

 100th meridian. 



Autarkean Society 



A simple, independent, economic human society consist- 

 ing of nomadic or sparsely distributed individuals, cf. Allelar- 

 kean society. 



Autecology 



The study of the individual, or members of a species 

 considered collectively, in relation to environmental condi- 

 tions, cf. Ecology, Synecology. 



Autochore 



A species in which the action of the parent plant is the 

 chief force of dissemination, e.g., the mechanical projection 

 of seeds in vetch, cf. Anemochore, Diaspore. 



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