The Li7(p, n) total cross section has been measured in detail from threshold to 2.5-Mev proton energy. Between 1.88 and 1.92 Mev the cross section follows the equation for a very broad 2- resonance and for s-wave particles: σpn=(52)πλ/2x(1+x)2, where x=ΓnΓp=1 at 50 kev above threshold. The remainder of the cross section up to 2.35 Mev is fitted by this level and the 3+ level at 2.25 Mev. The neutron reduced width exceeds that of the proton by a factor of about five for both the 2- and 3+ levels; this is surprising for the self-mirror nucleus Be8. A small dip is observed just above neutron threshold in the yield of 478-kev gamma rays from Li7(p, p'γ). The shape of these data support the assumption of the broad 2- neutron producing resonance with Γp>0.5 Mev. No anomaly is observed in the yield of Li capture gamma rays at neutron threshold; the 2.10-Mev resonance in this reaction (which probably is due to a 3+/- level) yields mainly 16-Mev gamma rays leading to the 2.9-Mev 2+/- level in Be8. The ratio of 16 to 19 Mev gamma rays is 32 at both 1.7- and 2.5-Mev proton energy. The behavior of the Li7(p, n) extrapolated threshold was calculated as a function of target thickness and proton energy spread; shifts in the extrapolated thresholds and the distances between them and true threshold were less than one kev. The extrapolated threshold of a 1/2 -kev target taken with a proton energy spread of 1 kev was observed to be 1/2 kev lower in proton energy than a thick-target threshold.