  We present a chemical composition analysis of three dozen giant stars in the
nearby ``CN-bimodal'' mildly metal-poor (<[Fe/H]> = -1.18) globular cluster M4.
The analysis combined traditional spectroscopic abundance methods with
modifications to the line-depth ratio technique pioneered by Gray (1994).
Silicon and aluminum are found to be primordially overabundant by factors
exceeding the mild overabundances usually seen in alpha- and light odd elements
among halo field and globular cluster giants of comparable metallicity. In
addition, barium is found to be overabundant by a factor of about four.
Superimposed on the primordial abundance distribution in M4, there is evidence
for the existence of proton-capture synthesis of C, O, Ne, and Mg.
