A penny tract is the shoeing-horn of literature: it draws on a great many books, and some too tight to be very useful in walking. The penny tract quotes a celebrated writer, you long to read him; it props a startling assertion by a grave authority, you long to refer to it. During the nights of the past winter, Leonard's intelligence had made vast progress: he had taught himself more than the elements of mechanics, and put to practice the principles he had acquired, not only in the hydraulical achievement of the fountain, nor in the still more notable application of science, commenced on the stream in which Jackeymo had fished for minnows, and which Lenny had diverted to the purpose of irrigating two fields, but in various ingenious contrivances for the facilitation or abridgment of labor, which had excited great wonder and praise in the neighborhood. On the other hand, those rabid little tracts, which dealt so summarily with the destinies of the human race, even when his growing reason, and the perusal of works more classical or more logical, had led him to perceive that they were illiterate, and to suspect that they jumped from premises to conclusions with a celerity very different from the careful ratiocination of mechanical science, had still, in the citations and references wherewith they abounded, lured him on to philosophers more specious and more perilous. Out of the Tinker's bag he had drawn a translation of Condorcet's _Progress of Man_, and another of Rousseau's _Social Contract_. These had induced him to select from the tracts in the Tinker's miscellany those which abounded most in professions of philanthropy, and predictions of some coming Golden Age, to which old Saturn's was a joke--tracts so mild and mother-like in their language, that it required a much more practical experience than Lenny's to perceive that you would have to pass a river of blood before you had the slightest chance of setting foot on the flowery banks on which they invited you to repose--tracts which rouged poor Christianity on the cheeks, clapped a crown of innocent daffodillies on her head, and set her to dancing a _pas de zephyr_ in the pastoral ballet in which St. Simon pipes to the flock he shears; or having first laid it down as a preliminary axiom, that "The cloud-capt towers, the gorgeous palaces, The solemn temples, the great globe itself-- Yea, all which it inherit, shall dissolve," substituted in place thereof Monsieur Fourier's symmetrical phalanstere, or Mr. Owen's architectural parallelogram. It was with some such tract that Lenny was seasoning his crusts and his radishes, when Riccabocca, bending his long dark face over the student's shoulder, said abruptly-- "_Diavolo_, my friend! What on earth have you got there? Just let me look at it, will you?" Leonard rose respectfully, and colored deeply as he surrendered the tract to Riccabocca.