Secondary Sexual Character 



A characteristic, not directly associated with the char- 

 acters directly connected with reproduction, in which the 

 male and female animals differ, such as the difference in 

 coloration of many male and female birds. 



Secondary Species 



The species in a community that are subordinate to the 

 Dominant species (q. v.), e.g., dogwood shrubs or trees in a 

 white oak forest. 



Secondary Succession 



The kind of Succession (q. v.) which takes place follow- 

 ing the destruction of part or all of the vegetation in an 

 area, usually caused directly or indirectly by man. cf . Primary 

 succession, Sere, Plagiosere, Sub sere. 



Second-foot 



A measuring unit for the volume of the flow of water 

 expressed in cubic feet per second. 



Second Growth 



(1) A forest which comes up after the removal of the old 

 stand by cutting, fire, or other cause; actually Young growth. 

 (2) The smaller trees left after cutting all the merchantable 

 trees, actually Residual stand, cf. Virgin forest, Advance 

 growth. 



Secretion 



The process of passing substances made within a cell, par- 

 ticularly gland cells, to the outside of the cell; or the sub- 

 stance itself, e.g., nectar from nectar glands in flowers. 



Sedentary 



Refers to an animal that has little tendency to move 

 about, e.g., certain spiders, cf. Sessile. 



Sedge 



A plant, resembling a grass in vegetative appearance, in 



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