efficaciousness

Learn then, that I am the inventor of the Vermifuge Balsam, whose sovereign efficaciousness is indisputable.

Yet it is evident that they could not have any physical efficaciousness.

Nothing that we learn could possibly suggest to us the idea of what an influence or efficaciousness is.

A friend of Homœopathy, not a physician, desired to test the efficaciousness of this plant.

A single one of its thrusts must equal and often surpass in efficaciousness the repeated wounds of the other.