  Several new developments in the calculation and interpretation of hadron
density-density correlation functions are presented. The asymptotic behavior of
correlation functions is determined from a tree diagram path integral. A method
is developed to use this behavior to correct for leading image contributions on
a finite periodic spatial lattice and to correct for the finite temporal extent
of the lattice. Equal time correlation functions are shown to determine a sum
of the ground state rms radius plus a polarization correction, and it is shown
how to extract the hadron polarizability from unequal time correlation
functions. Image-corrected correlation functions calculated in quenched lattice
QCD are presented and used to determine the size of the pion and nucleon.
