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an average would seem to be largely valid for distributions if not for end-point energies.In view of the great difficulty of measuring the beta-spectrum of H 3 , the concordance of adjusted data is remarkable. In terms of average deviations from the mean, it appears that the shape of the distribution function is now known to a precision of about 3 percent from 0.5 to 5.5 kev, about 1 percent from 6 to 11 kev, about 5 percent from 11.5 to 17.5 kev, and about 25 percent on up to within 2 percent of the end-point energy. Equally remarkable is the fact that the deviations of the composite from the theoretical spectrum are generally comparable with (in most cases less than) the corresponding average deviations of the measurements, except at the very lowest and highest energies where the measurements are very uncertain. A Fermi plot of the points in Figs. 1 and 2 is extremely satisfying from 2.5 to 18 kev; although the point at 0.9 kev is somewhat low, the points at 1.8 kev and above 18 kev are high (this last one about 100 percent).

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