(31) It is evident also that the mispaginations in the Shakespearian Folios and other volumes are keys to Baconian ciphers, for re-editions--often from new type and by different printers--contain the same mistakes. For example, the First and Second Folios of Shakespeare are printed from entirely different type and by different printers nine years apart, but in both editions page 153 of the Comedies is numbered 151, and pages 249 and 250 are numbered 250 and 251 respectively. Also in the 1640 edition of Bacon's The Advancement and Proficience of Learning, pages 353 and 354 are numbered 351 and 352 respectively, and in the 1641 edition of Du Bartas' Divine Weeks pages 346 to 350 inclusive are entirely missing, while page 450 is numbered 442. The frequency with which pages ending in numbers 50, 51, 52,53, and 54 are involved will he noted.