Seed Tree 



A tree purposely left standing at the time of cutting a 

 forest, for the purpose of producing seed for reproduction 

 of trees in the surrounding area. 



Seed Year 



A year in which a given species bears seed in large 

 numbers. 



Seepage 



(1) The water that passes through or emerges from the 

 ground along a line or surface in contrast to a spring where 

 the water emerges from a localized spot. (2) The process 

 by which water passes through the soil. 



Segregation 



Separation of the Gene pairs (Alleles) and distribution 

 of each gene into separate cells during Meiosis (q. v.). 



Seiche 



An oscillation in the level of the surface of a lake or 

 inland sea. 



Selection 



See Artificial selection, Natural selection. 



Selection Pressure 



A criterion of the results of Natural selection (q. v.) upon 

 a population. 



Selective Cutting (Felling) 



The system of removing certain trees such as the largest 

 ones in a forest, cf. Clear cutting. 



Selective Grazing 



The habit of grazing animals to eat certain plants in 

 preference to others, cf. Palatability. 



Selective Species 



The group of Characteristic species (q. v.) in Braun- 



305 



