HE longevity of the Mule is proverbial. He lives on and on, until his origin becomes a musty myth, and age erects a tumor on his brow which betokens superb development of spirituality. The endurance of a hallucination is perhaps greater still. Our civil war closed more than thirty years ago. The Mules employed in the army are mostly dead-not so the hallucinations. These still linger, picturesque but fatiguing. There still survives in every northern town and village at least one man who habitually asserts, who is willing to verify by affidavit, worst of all, who steadfastly believes, that he put down the rebellion.