Stopping powers of Al, Ti, Cu, Zr, Rh, Ag, Ta and Au for 26 MeV alpha particles have been measured using a surface barrier silicon detector with an accuracy of 0.35%. The stopping powers for alpha particles divided by 4 have been compared with the stopping powers for 6.500 MeV protons of the same velocity. Experimental magnitudes of theZ31correction which is contained in the Bethe-Bloch stopping formula were extracted using the alpha-proton difference. Using the experimentalZ31corrections thus obtained and the experimentalZ31corrections of the previous paper, parameters of γ andbwhich appear in the theory of Ashley, Ritchie and Brandt for theZ31correction have been determined with exactly the same method as the previous paper as γ = 1.336 andb= 1.32. The magnitude of theZ31correction calculated by the theory of Ashley, Ritchie and Brandt using these parameters have been compared with those obtained by other authors.