A series of absorption lines of ${\mathrm{C}}^{12}$${\mathrm{H}}_3$${\mathrm{O}}^{16}$H which was studied from $J=2\mathrm{}$ to $J=10\mathrm{}$ by Coles has now been followed up to $J=30\mathrm{}$. The corresponding series for ${\mathrm{C}}^{13}$${\mathrm{H}}_3$${\mathrm{O}}^{16}$H and ${\mathrm{C}}^{12}$${\mathrm{H}}_3$${\mathrm{O}}^{18}$H have been found. The lines of the ${\mathrm{C}}^{13}$${\mathrm{H}}_3$${\mathrm{O}}^{16}$H series have been identified and measured from $J=2\mathrm{}$ to $J=31\mathrm{}$ and the lines of the ${\mathrm{C}}^{12}$${\mathrm{H}}_3$${\mathrm{O}}^{18}$H series from $J=2\mathrm{}$ to $J=26\mathrm{}$. Accurate Stark-effect measurements have been made of several low $J$ lines of each of the above series and the coefficients tabulated. The frequencies of many other ${\mathrm{C}}^{12}$${\mathrm{H}}_3$${\mathrm{O}}^{16}$H lines between 20,000 and 40,000 Mc have been measured and tabulated. The order of the Stark effect, quantitative Stark-effect information, and $J$ values of these lines are listed when known. The frequencies of several ${\mathrm{C}}^{13}$${\mathrm{H}}_3$${\mathrm{O}}^{16}$H lines which are not members of the above series are listed.

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