  Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle
spectra covering the range $1.5-1.8 \mu \rm m$ for the highly reddened bulge
globular clusters Terzan 4 and Terzan 5. The clusters are of interest because a
blue horizontal branch in Terzan 4 is consistent with very low metallicity,
while Terzan 5 has been proposed as possibly the most metal rich known Galactic
globular cluster. We report the first detailed abundance analysis for stars in
these clusters, and we find [Fe/H]=--1.60 and --0.21 dex for Terzan 4 and
Terzan 5, respectively, confirming the presence of a large metallicity spread
in the bulge as well as in the halo of the Galaxy. We find $\rm
[\alpha/Fe]\approx+0.5$ dex in Terzan 4 and $\rm [\alpha/Fe]\approx +0.3$ dex
in Terzan 5, consistent with what has been found for field stars in the bulge.
The enhanced $\alpha-$element abundances are also consistent with rapid
chemical enrichment, most likely by type II SNe. Finally, we measure very low
$^{12}$C/$^{13}$C$\le10$ ratios in all the giant stars, confirming that
extra-mixing mechanisms due to {\it cool bottom processing} occur during
evolution along the RGB.
