  We establish an asymptotic formula for the number of integer solutions to the
Markoff-Hurwitz equation \[
x_{1}^{2}+x_{2}^{2}+\ldots+x_{n}^{2}=ax_{1}x_{2}\ldots x_{n}+k. \] When
$n\geq4$ the previous best result is by Baragar (1998) that gives an
exponential rate of growth with exponent $\beta$ that is not in general an
integer when $n\geq 4$. We give a new interpretation of this exponent of growth
in terms of the unique parameter for which there exists a certain conformal
measure on projective space.
