  I study the dynamical effects due to the Brans-Dicke scalar $\phi$-field at
the early stages of a supposedly anisotropic Universe expansion in the
scalar-tensor cosmology of Jordan-Brans-Dicke. This is done considering the
behaviour of the general solutions for the homogeneous model of Bianchi type
VII in the vacuum case. I conclude that the Bianchi-VII$_0$ model shows an
isotropic expansion and that its only physical solution is equivalent to a
Friedman-Robertson-Walker spacetime whose evolution can, depending on the value
of the JBD coupling constant, begin in a singularity and, after expanding
(inflating, if $\omega>0$), shrink to another, or starting in a non-singular
state, collapse to a singularity. I also conclude that the general
Bianchi-VII$_h$ (with $h\neq 0$) models show strong curvature singularities
producing a complete collapse of the homogeinity surfaces to 2D-manifolds, to
1D-manifolds or to single points. Our analysis depends crucially on the
introduction of the so-called intrinsic time, $\Phi$, as the product of the JBD
scalar field $\phi$ times a mean scale factor $a^3=a_1a_2a_3$, in which the
finite-cosmological-time evolution of this universe unfolds into an infinite
$\Phi$-range. These universes isotropize from an anisotropic initial state,
thence I conclude that they are stable against anisotropic perturbations.
