1. Sheet floods such as those that occurred in 1976 are principal agents . 2. He personally assumed the role of principal agent to the Muscogee. 3. Their principal agent was Theophilus Cazenove, later succeeded by Paolo Busti. 4. Largely through his connections, the firm became the principal agent for Missouri securities. 5. Williams'principal agent , Roosevelt Barnes, was traveling and not available for comment, his office said. 6. You are and must be the principal agents of your own personal and national history. 7. The governors are the principal agents for change here, 8. Such criticisms stimulated continued studies on protoplasm as the principal agent determining cell permeability properties. 9. As principal agent to the Georgia where he established his home and the Creek Agency. 10. Adult attention is the cause, the effect and the principal agent of change in children's behavior.