Environmental Conditioning 



See Conditioning, environmental. 



Environmental Form 



See Ecad. 



Environment, Holocoenotic 



The concept that the environmental factors act as a 

 whole or aggregate in their effect upon one or more or- 

 ganisms. 



Environmental Resistance 



The restriction caused by environmental factors upon 

 the increase in numbers of individuals in a population, cf. 

 Biotic potential, Reproductive potential. 



Enzyme 



An organic catalyst, produced by living cells, each kind 

 determining a specific chemical reaction, e. g., diastase which 

 digests starch. 



Eocene 



The second geological epoch in the Cenozoic Era, Ter- 

 tiary period, began about 58 million years ago and lasted for 

 about 19 million years. 



Eolian 



See Aeolian. 



Epeirogenesis 



Great alterations in the level of the crust of the earth 

 such as the elevation or lowering of the surface of con- 

 tinents. 



Epharmone 



An organism which has been subjected to Epharmony 

 (q. v.). See ecad. 



127 



