The reference appears to be not to the Cross as the instrument of that Death which was of saving efficacy, but to miraculous cures, real or reputed, effected by means of the actual wood of the Cross. The argument seems to require that we should understand the Cross itself, and not only the sacrifice offered upon it, to be the means of producing wondrous effects: and the grammatical construction favours this view. S. Cyril of Jerusalem mentions the extensive distribution of fragments of the Cross (Cat. x. 19), but this is probably one of the earliest references to miracles worked by their means.