PLAGUE OF FROGS. (Exo 8:1-15) the Lord spake unto Moses, Go unto Pharaoh--The duration of the first plague for a whole week must have satisfied all that it was produced not by any accidental causes, but by the agency of omnipotent power. As a judgment of God, however, it produced no good effect, and Moses was commanded to wait on the king and threaten him, in the event of his continued obstinacy, with the infliction of a new and different plague. As Pharaoh's answer is not given, it may be inferred to have been unfavorable, for the rod was again raised.