  We derive correlations between X-ray temperature, luminosity, and gas mass
for a sample of 22 distant, z>0.4, galaxy clusters observed with Chandra. We
detect evolution in all three correlations between z>0.4 and the present epoch.
In particular, in the Omega=0.3, Lambda=0.7 cosmology, the luminosity
corresponding to a fixed temperature scales approximately as (1+z)**(1.5+-0.3);
the gas mass for a fixed luminosity scales as (1+z)**(-1.8+-0.4); and the gas
mass for a fixed temperature scales as (1+z)**(-0.5+-0.4) (all uncertainties
are 90% confidence). We briefly discuss the implication of these results for
cluster evolution models.
