apart jtou ror ms aangnxer.Reqabdino Dowib and Otiiku Mebblahb.—T'other morning's mail contained a most peculiar communication, uniqno from its import, and peculiar from tho fact of ita having como all the way From India. Mirra Shalom Ahmad, of Oadian, Punjab, India, writes to aay that he is the Messiah, and that Dowio - and Pigott are merely imposters. Ho defiantly challenges Dowio to prove bis claim, and offers to leave the question to the arbitration of the Omnipotent,— Who ever ia tho liar, perishing first. The final (if Dowio takes tho challenge) shnnlH hn intflreHtinf»