- Page 43, line 8:

Please add ``-*G mu (1-lambda)*'' to the RHS of the equation involving the pressures. - Page 46, equation (25):

Please modify the LHS to read: ``*Psi*'';_{j}(x, sigma, t)

insert a minus sign next to the ``='' sign;

change ``cos'' to``sin''. - Page 47, second line after equation (29):

Please change ``(3.6)'' to ``(36)''. - Page 47, equation (30):

Please change ``'' to ``*u**u*'' on the LHS;

change ``*sigma*'' to ``*f*'' in two places on the RHS;

change ``*z*'' to ``*x*'' on the RHS.