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A study of the ¹⁸O(¹⁸O, ¹⁷F)¹⁹N reaction with E(¹⁸O) = 91 MeV leads to a mass excess for ¹⁹N of 15.81 ± 0.09 MeV: at θ=10°, dσ/dΩ_cm=100 nb/sr (DE77C). ¹⁹N is then stable with respect to breakup into ¹⁸N + n by 5.5 MeV. Another report of the mass excess of ¹⁹N gives 15.96 ± 0.15 MeV (BA77I; abstract). A previous report by (GU74D) of the formation of ¹⁹N in ¹⁰Be(¹¹B, 2p) and of its subsequent β-decay is incorrect: see (FI76A). For mass calculations see (TH74, JE75, JA76M, WA76L, WA77). See also (72AJ02), (TH72K, WA72A, TO73G, AR77B, BH77) and (WI73J, BE75Q; theor.).