1: experimental transition temperatures for vanadium oxides. 2: calculated ’s using the Animalu potential with , but with varied valence (see the appendix). 3: effective masses (in the units of the mass of a free electron) calculated from the experimental values of ’s; see also Table 1. 4: parameter as a function of the oxygen stoichiometric index, calculated using (1) and specific gravities of all the oxides.