The cilium as a key to the structure of contractile protoplasm

Stuart bases his view on observations made on ciliated cells of "Aolidenlarven." He saw running through the cells parallel fibers some of whichwent to the nucleus.During cell activity, he observed that when the cilia were in motion the nucleus was also affected, and concluded that the structures in question were contractile fibers by which the cilia and nucleus were moved.Third, that cilia are complex fluids.PLATE 11.