The spectrum of silane has been investigated to beyond 13.0μ. Bands, enumerated in the order of their intensities, were located at 11.0μ (910 ${\mathrm{cm}}^{-1\mathrm{}}$), 4.6μ (2183 ${\mathrm{cm}}^{-1\mathrm{}}$), 3.17μ (3153 ${\mathrm{cm}}^{-1\mathrm{}}$), 3.23μ (3095 ${\mathrm{cm}}^{-1\mathrm{}}$), 5.5μ (1820 ${\mathrm{cm}}^{-1\mathrm{}}$) and 2.3μ (4360 ${\mathrm{cm}}^{-1\mathrm{}}$). Four of these regions have been investigated under higher dispersion and partially resolved. The spectrum appears quite similar, except for certain details, to that of methane and by analogy the above bands have been identified as ${\nu }_4$, ${\nu }_3$, ${\nu }_1+{\nu }_4$, ${\nu }_3+{\nu }_4$, $2{\nu }_4$ and $2{\nu }_3$. From these values one may determine ${\nu }_1$ which takes the value 2243 ${\mathrm{cm}}^{-1\mathrm{}}$. By the methods developed by Dennison and Johnston one may determine the moment of inertia which from the most probable value for the spacing between lines takes the value $I_0=8.9\mathrm{}\times {10}^{-40\mathrm{}}$ g ${\mathrm{cm}}^2$.

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