basically the cytoplasm is a complex colloidal system. Its collidal structure was suggested by Fisher and hardy.It consists of high water contents containing various solutes of biological importance such as . These solutes may be either soluble in water making it a homogeneous mass or insoluble in it. thus making it a heterogeneous mass. This suspension of particles in the protoplasm is the basis for its colloidal nature. the various components give the appearance to protoplasm of four different kinds.