1. Page 43, line 8:
    Please add ``-G mu (1-lambda)'' to the RHS of the equation involving the pressures.

  2. Page 46, equation (25):
    Please modify the LHS to read: `` Psij(x, sigma, t)'';
    insert a minus sign next to the ``='' sign;
    change ``cos'' to``sin''.

  3. Page 47, second line after equation (29):
    Please change ``(3.6)'' to ``(36)''.

  4. Page 47, equation (30):
    Please change ``u'' to ``u'' on the LHS;
    change ``sigma'' to ``f'' in two places on the RHS;
    change ``z'' to ``x'' on the RHS.