Cross sections for pair production by 2.615-MeV $\ensuremath{\gamma}$ rays incident on Al, Cu, Cd, and Pb have been found by subtracting tabulated values of the photoelectric cross section from measured values of total cross sections. The latter were determined to be 129.8, 137.0, 147.6, and 181.9 mb per electron, respectively, for the above elements. The statistical uncertainty is \ifmmode\pm\else\textpm\fi{}0.2%. Subtraction of photoelectric cross sections gives 0.0642 (\ifmmode\pm\else\textpm\fi{}5%), 0.343 (\ifmmode\pm\else\textpm\fi{}2.3%), 0.991 (\ifmmode\pm\else\textpm\fi{}1.4%), and 3.55 (\ifmmode\pm\else\textpm\fi{}0.8%) b per atom for pair production. The present result in Pb is 38.9% higher than the Bethe-Heitler Born approximation result and is about 14% higher than Jaeger-Hulme non-Born theoretical results but only 6% higher than the recent, exact non-Born calculation (neglecting screening) by \O{}verb\o{}, Mork, and Olsen. Differences between our values for Al, Cu, and Cd and the calculated values of these authors are even smaller, namely, 0.5% for Al and Cd, and 3% for Cu. It is pointed out that pair-production cross sections can be found from Born-approximation values by multiplication by $a+bZ$ for $0<Z<50$, with $a=0.97\ifmmode\pm\else\textpm\fi{}0.01$ and $b=4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and by a factor $1+\ensuremath{\alpha}{Z}^{2}$ for $Z\ensuremath{\ge}50$ with $\ensuremath{\alpha}=(5.8\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.