Cybernetics 



The study of kinds of communication and control sys- 

 tems in human beings and in machines. 



Cycle (Population) 



The regular or approximately regular oscillation in the 

 abundance of a population or species. An Intrinsic cycle is 

 caused by the interactions within populations of one or more 

 species, an Extrinsic cycle is caused by changes in the physical 

 or biotic environment. 



Cycle of Erosion 



The changes brought about by erosion from youthful to 

 mature to old-age Topography. 



Cyclomorphosis 



The change in form of some animals in accord with the 

 season of the year as occurs in Cladocera. 



Cyclosis 



The streaming of Cytoplasm in plant cells. 



Cytogenetics 



The combination of Cytology and Genetics in the study 

 of variation in organisms. 



Cytology 



The study of cells of organisms, a branch of biology. 



Cytolysis 



The disintegration of a cell. 



Cytoplasm 



The Protoplasm of the cell excluding the Nucleus. 



Cytotaxonomy 



The combination of Cytology and Taxonomy in the 

 study of classification of plants. 



102 



