  We present mid-infrared maps and preliminary analysis for 61 galaxies
observed with the ISOCAM instrument aboard the Infrared Space Observatory. Many
of the general features of galaxies observed at optical wavelengths---spiral
arms, disks, rings, and bright knots of emission---are also seen in the
mid-infrared, except the prominent optical bulges are absent at 6.75 and 15
microns. In addition, the maps are quite similar at 6.75 and 15 microns, except
for a few cases where a central starburst leads to lower 6.75/15 ratios in the
inner region. We also present infrared flux densities and mid-infrared sizes
for these galaxies. The mid-infrared color 6.75/15 shows a distinct trend with
the far-infrared color 60/100. The quiescent galaxies in our sample (60/100 <
0.6) show 6.75/15 near unity, whereas this ratio drops significantly for
galaxies with higher global heating intensity levels. Azimuthally-averaged
surface brightness profiles indicate the extent to which the mid-infrared flux
is centrally concentrated, and provide information on the radial dependence of
mid-infrared colors. The galaxies are mostly well resolved in these maps:
almost half of them have < 10% of their flux in the central resolution element.
A comparison of optical and mid-infrared isophotal profiles indicates that the
optical flux at 4400 Angstroms near the optical outskirts of the galaxies is
approximately eight (seven) times that at 6.75 microns (15 microns), comparable
with observations of the diffuse quiescent regions of the Milky Way.
