When positive and negative ions are assumed to move through flame gases under the influence of mutually perpendicular electric and magnetic fields and a retarding force of the nature of viscous resistance, the expression derived for magneto-resistance is found not to agree with experiment. It is then assumed that the Hall e.m.f. produced by the deflection of negative ions exerts a dragging effect on the positive ions, which in turn exert a drag on the upward moving flame molecules and thus alter the upward velocity of the flame gases. Allowing for this change of flame velocity, equations for the Hall effect and for the magneto-resistance effect are obtained which are in accord with experiment. The Hall effect is shown to be proportional to the difference of mobilities of positive and negative ions ($k_1-k_2$) divided by ($1+\frac{\mathrm{dR}}{R}$), where $\frac{\mathrm{dR}}{R}$ is the magneto-resistance effect.

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