  Our starting point is the measure
$\epsilon_x-\alpha_x\rho_x^{\omega_1}+\beta_x\rho_x^{\omega_2}$, where
$\rho_x^{\omega_i}$ is the harmonic measure relative to $x \in \omega_1 \subset
\overline{\omega}_1 \subset \omega_2$ and $\omega_i$ are concentric balls of
$\R^n$; $\alpha_x$, $\beta_x$ are functions depending on $x$ and on the radii
of $\omega_i$, $(i=1,2)$. Generalizing the above measure, we introduce and
study the binormal measures as well as their relation to biharmonic functions.
