"When fishes fly, and swallows dive, Young men they will prove true."
And one of the same ballad-family sets out with the affecting declaration, that--
"When gooseberries grow on the stem of a daisy,"
the singer's passion will be no more. These, and a thousand examples of the "Not till then," are but versions of the Hebrew assumption of impossibility, expressed in the grotesque fancy of "the ass on the ladder." But it is clear that Meyer the son of Rabbi Jacob was not in Moorfields last year; it is certain that Abraham, the son of Rabbi Nathan, little dreamed of what would be doing at Pimlico in the nineteenth century; for whether at Mayfair or at Bethnal Green, at Wapping or at Islington, one or both must have seen the impossibility realised, in the elevation of the donkey, before the upturned wondering eyes of a crowd of lingering mortals in the public thoroughfares.
Lest there should be some who never saw the modern street-mountebank, going forth like Leporello with his ladder, and like Sancho with his donkey, we must describe his performance. His greatest feat consisted in balancing upon his chin a ladder with an ass on it. All other tricks performed, and all eyes and mouths opened, curiosity on tiptoe and incredulity on the stretch, forth came the wooden machine, and with legs twisted through the staves, up went the animal. "Who," exclaims the minstrel, "Ah who can tell how hard it is to climb!" But what poet ever found a steep so difficult as that _gradus ad Parnassum_ to the seemingly dislocated donkey? To the topmast round, you would see him clinging like Shakspeare's giddy sea-boy on the mast; and surveying the mountebank who had taught him to be such an astonishing ass, with a look that seemed to say, "You're another!" Then would his master send round the hat upon its last and greatest voyage of discovery; then would the halfpence therein be rattled harmlessly in the vacant faces of boys with vacant pockets, and then would the irresistible appeal be heard, "Come, good gen'lemen, be liberal, be liberal--tuppence more, and up goes the donkey." Then bending up each corporal agent for the terrible feat, up indeed would go the ladder, donkey and all; high up in air, until its lowest stave rested fairly and firmly on the protruded chin of the mountebank, where it stood poised, fixed, moveless--the astonishing type, or rather the exact model, of the balance of power in Europe.