Benzene (${\mathrm{C}}_6$${\mathrm{H}}_6$) and carbon bisulfide (C${\mathrm{S}}_2$) have been analyzed by a mass-spectrograph designed especially for use with large molecules. In the case of benzene, ions have been found containing carbon in amounts from ${\mathrm{C}}_1$ to ${\mathrm{C}}_6$ with various amounts of hydrogen attached. The principal ion for electrons of 120 e-volts is ${\mathrm{C}}_6$${\mathrm{H}}_6^{+}$. No negative ions and no ${\mathrm{H}}^{+}$ ions were detected. Impacts of positive ions in the ionization chamber detach H atoms from the carbon ring, but the carbon content of all observed ions seems to be unaffected by such collisions. The carbon-to-carbon bonds appear to be more stable than in the straight-chain hydrocarbons. Carbon bisulfide was used principally to calibrate the mass scale, and no extensive work done on it. At a pressure of 9.7×${10}^{-3\mathrm{}}$ mm Hg and impacts of 120 e-volts, the ions observed were C${\mathrm{S}}_2^{+}$, C${\mathrm{S}}^{+}$, ${\mathrm{S}}^{+}$, and ${\mathrm{C}}^{+}$.

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