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References in classic literature ?
Yes, efficacious grace has touched you, as that gentleman said just now.
Luke's where he had been a student, and had used all his life; he found them just as efficacious as anything that had come into fashion since.
Sabor proved unsavory eating even to Tarzan of the Apes, but hunger served as a most efficacious disguise to toughness and rank taste, and ere long, with well-filled stomach, the ape-man was ready to sleep again.
Nothing could be more efficacious for reawakening his mind to religious influences than the prostration of his heart and mind and soul beneath the feeling of such acute wretchedness.
You know, it often is so - those simple, old-fashioned remedies are sometimes more efficacious than all the dispensary stuff.
Thus while the manners of Porthos are more polite it may be argued that those of David are more efficacious.
Whatever the creature was that had seized him, it apparently had a well-defined purpose in mind, for it walked directly toward the edge of the roof so that it was soon apparent to Tarzan that he was to be hurled to the pavement below--a most efficacious manner of disposing of an intruder.
The man was armed with a stout stick--as efficacious against a hungry lion, he realized, as a toy pop-gun charged with a tethered cork.
A letter," Wingrave answered, "would have been equally efficacious.
She interested him in that she presented a distraction, and because both she and her father considered him a saint whose prayers were efficacious.
The same pressures and caresses, unaccompanied by speech, that were efficacious with the girls of the working-class, were equally efficacious with the girls above the working-class.
His naked fangs and writhing lips were uniformly efficacious, rarely failing to send a bellowing on-rushing dog back on its haunches.