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The theories of the lattice and electronic specific heats are reviewed, and experimental results are given for alkali metals, noble metals, divalent and transition metals, rare-earth metals, and superconductors. The Debye temperatures of silver, obtained from experiment and three theories, are compared and plotted as a function of thermodynamic temperature from 1 K to 96 K. The effective mass m*, defined by m*/m = γ (expt)/γ (free electron), is 0.95. From this relation the electronic specific heat is Ce = (m*/m)·γT, where γ = 0.66 mJ/(mol·K2) for silver of “99.999 % purity.”