  The dynamical effects on the scale factors due to the scalar $\phi$-field at
the early stages of a supposedly anisotropic Universe expansion in the
scalar-tensor cosmology of Jordan-Brans and Dicke is studied. This universe
shows an {\sl isotropic} evolution and, depending on the value of the theorie's
coupling parameter $\omega$, it can begin from a singularity if $\omega>0$ and
after expanding shrink to another one; or, if $\omega <0$ and $-3/2< \omega\leq
-4/3$, it can evolve from a flat spatially-infinite state to a non extended
singularity; or, if $ -4/3 < \omega < 0$, evolve from an extended singularity
to a non singular state and, at last, proceed towards a singularity.
