Aliquote 



The constant of temperature for a certain stage in the 

 life-cycle of an organism. See Temperature summation. 



Alkali Reserve 



The total amount of dissolved salts or other substances 

 which tend to maintain the normal alkalinity of a natural 

 water or the internal body fluid of an organism. 



Alkali Soil 



A soil that has such a high degree of Alkalinity (pH 8.5 

 or higher), or such a high percentage of exchangeable sodium 

 (15 per cent or more), or both, that the growth of most crop 

 plants is reduced or prevented. See Black alkali, Saline soil. 



Alkaline Soil 



A non-acid soil which contains more hydroxyl ions than 

 hydrogen ions; precisely, a soil with pH 7.0 or higher; for 

 practical purposes, with pH 7.3 or higher. 



Alkalinity 



The chemical state of water or other substance in which 

 the hydroxyl ions exceed the hydrogen ions, usually with 

 pH 7.0 or higher, cf. Salinity. 



Alleghanian Life Zone 



One of the divisions of Merriam's Austral life zone (q. v.), 

 east of the 100th meridian. See Life zone. 



Allelarkean Society 



An independent, dense, fixed, civilized society, cf. 

 Autarkean society. 



Allele 



One of the two forms of a gene located at a certain 

 position (locus) on a homologous chromosome (q. v.). If one 

 allele of a pair is dominant to the other it largely controls 

 the character, e.g., greenness is dominant over albinism 

 (q. v.) in seedlings. 



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