  We present a number of arguments relating magnetic disorder to center
disorder, in pure Yang-Mills theory in D=3 and D=4 dimensions. In the case of
the D=3 Georgi-Glashow model, we point out that the abelian field distribution
is not adequatedly represented, at very large scales, by that of a monopole
Coulomb gas. The onset of center disorder is associated with the breakdown of
the Coulomb gas approximation; this scale is pushed off to infinity in the
QED_3 limit of the 3D Georgi-Glashow model, but should approach the
color-screening length in the pure Yang-Mills limit.
