General relativity limit of the scalar-tensor theories for traceless   matter field
  $\omega(\phi) \to \infty$ limit of scalar tensor theories are studied for traceless matter source. It is shown that the limit $\omega(\phi) \to \infty$ does not reduce a scalar tensor theory to general relativity.   An exact radiation solution of scalar tensor cosmology under Nordtvedt conditions is obtained for flat Friedmann universe. 
A. Bhadra (University of North Bengal)