On the force of effective molecular action

in which x denotes the distance between the electric envelopes of the contiguous molecules; r the distance between the center of emanation of the attractive force, f, represented by the first term, and that of the repulsion f', represented by the second term; n the coefficient of the attractionf, and m that of the repulsionf'. The expression has been simplified by making one or two assumptions that do not strictly accord with fact, but which can occasion no material error in the general discussion now proposed; as will be shown on another occasion.