The annals of bibliography afford many examples of the delirious extent to which book-fancying can go, when the legitimate delight in a book is transferred to a rare edition or to a manuscript. This mania reached its height about the beginning of the present century. For an autograph of Shakspeare one hundred and fifty-five guineas were given. In May, 1812, the library of the Duke of Roxburgh was sold. The sale lasted forty-two days,--we abridge the story from Dibdin,--and among the many curiosities was a copy of Boccaccio published by Valdarfer, at Venice, in 1471; the only perfect copy of this edition. Among the distinguished company which attended the sale were the Duke of Devonshire, Earl Spencer, and the Duke of Marlborough, then Marquis of Blandford. The bid stood at five hundred guineas. "A thousand guineas," said Earl Spencer: "And ten," added the Marquis. You might hear a pin drop. All eyes were bent on the bidders. Now they talked apart, now ate a biscuit, now made a bet, but without the least thought of yielding one to the other. "Two thousand pounds," said the Marquis. The Earl Spencer bethought him like a prudent general of useless bloodshed and waste of powder, and had paused a quarter of a minute, when Lord Althorp with long steps came to his side, as if to bring his father a fresh lance to renew the fight. Father and son whispered together, and Earl Spencer exclaimed, "Two thousand two hundred and fifty pounds!" An electric shock went through the assembly. "And ten," quietly added the Marquis. There ended the strife. Ere Evans let the hammer fall, he paused; the ivory instrument swept the air; the spectators stood dumb, when the hammer fell. The stroke of its fall sounded on the farthest shores of Italy. The tap of that hammer was heard in the libraries of Rome, Milan, and Venice. Boccaccio stirred in his sleep of five hundred years, and M. Van Praet groped in vain amidst the royal alcoves in Paris, to detect a copy of the famed Valdarfer Boccaccio.