  The space of measured laminations $\mathcal{ML}(\Sigma)$ associated to a
topological surface $\Sigma$ of genus $g$ with $n$ punctures is an integral
piecewise linear manifold of real dimension $6g-6+2n$. There is also a natural
symplectic structure on $\mathcal{ML}(\Sigma)$ defined by Thurston. The
integral and symplectic structures define a pair of measures on
$\mathcal{ML}(\Sigma)$ which are known to be proportional. The projective class
of these measures on $\mathcal{ML}(\Sigma)$ is called the Thurston measure. In
this note we compute the ratio between two normailzations of the Thurston
measure.
