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| - IV. The hot dust component
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| - Survey of the ISM in early-type galaxies
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| - We present mid-IR photometric properties for a sample of 28 early-type galaxies observed at 6.75, 9.63 and 15 $\mu{} $m with the ISOCAM instrument on board the ISO satellite. We find total mid-IR luminosities in the range $(3{-}42) \times{} 10^{8}$$ L_{odot}$. The spectral energy distributions (SED) of the galaxies were derived using the mid-IR data together with previously published UV, optical and near-IR data. These SEDs clearly show a mid-IR emission coming from dust heated at $T \simeq 260$ K. Dust grains properties are inferred from the mid-IR colors. The masses of the hot dust component are in the range $10{-}400$$M_{odot}$. The relationship between the masses derived from mid-IR observations and those derived from visual extinction are discussed. The possible common heating source for the gas and dust is investigated through the correlations between ${\rm H}\alpha$ and mid-IR luminosities.
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