Sentence:  There are, we presume, different forms in different rituals; for in another that we heve seen, the bishop, while anointing and crossing the bell, prays God will send his Holy Spirit, that the bell may become sanctified for the repelling of all the power, snares, and illusions of the devil, for the souls of the dead, and especially for the <WSD>averruncation</WSD> of storms, thunder, and tempests! 
Meaning of the word marked with <WSD> tags:  (rare) (The act of) warding off, averting (something evil).