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The CNOC2 field galaxy redshift survey is designed to provide measurements ofthe evolution of galaxies and their clustering over the redshift range 0 to0.7. The sample is spread over four sky patches with a total area of about 1.5square degrees. Here we report preliminary results based on two of the skypatches, and the redshift range of 0.15 to 0.55. We find that galaxy evolutioncan be statistically described as nearly pure luminosity evolution of early andintermediate SED types, and nearly pure density evolution of the late SEDtypes. The correlation of blue galaxies relative to red galaxies is similar onlarge scales but drops by a factor of three on scales less than about 0.3/hmpc, approximately the mean scale of virialization. There is a clear, butsmall, 60%, change in clustering with 1.4 mag of luminosity. To minimize thesepopulation effects in our measurement of clustering evolution, we choosegalaxies with M_r^{k,e}<= -20 mag as a population whose members are most likelyto be conserved with redshift. Remarkably, the evolution of the clustereddensity in proper co-ordinates at r < 10/h Mpc, proportional to r_0^gamma(1+z)^3, is best described as a ``de-clustering'', (1+z)^{0.6+/-0.4}. Orequivalently, there is a weak growth of clustering in co-moving co-ordinates,x_0~ (1+z)^{-0.3 +/- 0.2}. This conclusion is supported by the pairwisepeculiar velocities which rise slightly, but not significantly, into the past.The Cosmic Virial Theorem applied to the CNOC2 data gives Q Omega_M/b=0.11 +/-0.04$, where Q is the three point correlation parameter and b the bias.Similarly, galaxy groups have a virial mass-to-light ratio (evolutioncorrected) of M_{virial}/L_R^{k,e} = 215h Lsun/Msun, or Omega_M=0.15 +/- 0.05.Comment: Presented at Royal Society Discussion Meeting, March 1998, "Large  Scale Structure in the Universe" 20 pages, uses rspublic_mod style file  include

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences