H. E. Duckworth^*, R. F. Woodcock^†, G. S. Stanford^‡, A. Coutu, and R. L. Stearns^§

• Wesleyan University, Middletown, Connecticut

• ^*Now at McMaster University, Hamilton, Ontario, Canada.
• ^†Now at Brown University, Providence, Rhode Island.
• ^‡Now at Yale University, New Haven, Connecticut.
• ^§Now at Case Institute of Technology, Cleveland, Ohio.