The bar method of Forbes was modified as follows. The metal rod, centered in a large test tube, was placed in a constant temperature bath and heated by a coil at the upper end. Convection in the tube was stopped by cardboard disks through which the rod was threaded and which were spaced at short intervals along the rod. Temperature gradient was determined by thermo-junctions spaced along the rod. Cooling curves were obtained on smaller lengths of the rod similarly mounted. With mean temperature not exceeding 15\ifmmode^\circ\else\textdegree\fi{} above bath temperature accurate values of $k$ were obtained.Lithium shows a linear increase in $k$ from 0.15 at 0\ifmmode^\circ\else\textdegree\fi{}C to 0.20 at -200\ifmmode^\circ\else\textdegree\fi{}C, thereafter rising sharply to 1.00 at -246\ifmmode^\circ\else\textdegree\fi{}C. Above 0\ifmmode^\circ\else\textdegree\fi{}C a minimum occurs at +40\ifmmode^\circ\else\textdegree\fi{}C and an increase thereafter to 0.17 at +140\ifmmode^\circ\else\textdegree\fi{}C. Sodium shows a linear increase from 0.28 at -40\ifmmode^\circ\else\textdegree\fi{}C to 0.40 at -240\ifmmode^\circ\else\textdegree\fi{}C. Above -40\ifmmode^\circ\else\textdegree\fi{}C an increase occurs to 0.34 at 0\ifmmode^\circ\else\textdegree\fi{}C and thereafter a decrease to 0.28 at +65\ifmmode^\circ\else\textdegree\fi{}C. The breaks in these lines correspond to breaks previously reported in electrical resistance and thermo-electric power lines for these metals.Electrical conductivity of Li and Na. To test the Wiedemann-Franz-Lorentz law the resistances of wires of lithium and sodium were measured at temperatures of ice, liquid oxygen and liquid hydrogen. The "constant" $\frac{k}{\ensuremath{\sigma}T}$ of the Wiedemann-Franz law was found to have at the higher temperatures the value predicted by the Lorentz theory, and to diminish steadily with temperature in accord with more modern theory.Specific heats of Li and Na. The specific heats of Li and Na were calculated by a comparison of cooling curves. The values found are in agreement with the best previous measurements and are extended to liquid hydrogen temperatures. At the higher temperatures the atomic heats of both metals exceed the Dulong and Petit maximum. It is suggested that this excess is latent heat of crystallization. At the lower temperatures the results do not show agreement with the Debye specific heat equation.