The excitation of curve for B ll (d,p) has been obtained by observing the intensity of the beta-rays from B 12 as a function of bombarding voltage from about 0.3 to 1.85 Mev. No resonance structure was observed in this region of bombardment. The yield at 1.47 Mev is approximately 10 7 beta-rays/microcoulomb of deuterons.The short-range protons which are formed in the above reaction were also observed in photographic plates, and range measurements showed that the Q-value of the reaction is 0.15 Mev. It is believed that this value does not represent the formation of B 12 in its ground state, however, but in an excited state at about 1.1 Mev. A group believed to be protons of higher energy (corresponding to Q=1.25 Mev) but of much lower intensity was subsequently observed.It was shown, by bombardment of enriched B 10 and of normal boron, that a gamma-ray of approximately 1.1 Mev energy is associated with the disintegration of B 11 by deuterons. It is therefore almost certain that this gamma-ray arises from the decay of B 12 to its ground state. Intensity measurements also indicate that this is the case.