Interstellar gas‐phase carbon‐to‐hydrogen ratio multiplied by 10⁶ versus the fractional H₂ abundance for all sight lines with weak line C II measurements. The points from left to right represent τ CMa (Sofia et al. 1997), δ Sco (Hobbs, York, & Oegerle 1982), λ Ori, β¹ Sco, ξ Per, ζ Per, ζ Oph (Cardelli et al. 1996), and HD 24534 (this Letter). The error bars represent the 1 σ uncertainties of the ratios. Also shown are a line at ﹩10^{6}\,\mathrm{C}\,/ \mathrm{H}\,=139﹩, which is the weighted average of the values, and a weighted linear fit to the data points (dotted line).