  Non-standard .sty file `equations.sty' now included inline. The critical
exponents of the metal--insulator transition in disordered systems have been
the subject of much published work containing often contradictory results.
Values ranging between $\half$ and $2$ can be found even in the recent
literature. In this paper the results of a long term study of the transition
are presented. The data have been calculated with sufficient accuracy (0.2\%)
that the calculated exponent can be quoted as $s=\nu=1.54 \pm 0.08$ with
confidence. The reasons for the previous scatter of results is discussed.
