  We present results on the Fundamental Plane of early-type galaxies in the
rich cluster CL 0024+16 at z=0.391. The galaxies satisfy a tight Fundamental
Plane relation which is similar to that at low redshift. The scatter is 15 % in
log re. The data show that massive early-type galaxies existed at z=0.4.
  The evolution of the M/L ratio is derived from the Fundamental Plane, by a
comparison with Coma. The M/L ratio increases by 31 +- 12 % between z=0.391,
and z=0.023. The evolution is low when compared to models for stellar
populations. The expected evolution depends on the IMF, q0, and the formation
redshift of the galaxies. The data are in agreement with high formation
redshifts. The most serious bias in the modeling may be the progenitor bias: if
the progenitors of some current day early-types are spirals at z=0.4, they
would not be included in the sample, and the sample would be biased towards the
oldest galaxies.
  More data are needed to measure the evolution of the Fundamental Plane more
precisely, and its scatter. There is a hint that the form of the Fundamental
Plane changes with redshift, and this needs to be determined better.
