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¹⁹C has been observed in the 0.8 GeV proton bombardment of thorium (VI86D) and in the fragmentation of 60 MeV/A argon ions (GI87B). The mass excess is 32.30 ± 0.24 MeV (VI86D), 32.95 ± 0.42 MeV (GI87B): the weighted mean is 32.46 ± 0.21 MeV. ¹⁹C is then stable with respect to decay into ¹⁸C + n by 0.53 MeV and into ¹⁷C + 2n by 4.72 MeV. The calculated half-life of ¹⁹C is 1.2 x 10^-2 sec (KL84A). See also (78AJ03, WA85C, AN86U, GU86H) and (AN83D, SA87G; theor.).