The rotational structure of the 0,0 band of the red CN system has been analyzed by means of spectrograms taken in the first order of a 21-foot grating. The values obtained for the various constants are ${B_0}^{\prime \prime }=1.8906\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${B_0}^{\prime }=1.6907\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${D_0}^{\prime }=-6.07\mathrm{}\times {10}^{-6\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $A=-53.3\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $p_0=0.009\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$ and $q_0=-0.0008\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$. These are in agreement with the values obtained by Jenkins, Roots and Mulliken for transitions which involve higher vibrational levels of the ${}_{}{}^2{}_{}{}^{}\Pi$ state. The origin of the band is at 10905.12 ${\mathrm{cm}}^{-1\mathrm{}}$.

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