(i. 85.), the work is "inconnu à tous les bibliographes." Compare Seemiller, ii. 162.; but the copy before me is not of the impression described by him. It is worthy of notice, that at signature A iiiij the writer declares, "nostris jam temporibus calchographiam, hoc est impressioram artem, in nobilissima Vrbanie germe Maguncia fuisse repertam."
5. Are we to suppose that either carelessness or a love of conjectures was the source of Chevillier's mistake, not corrected by Greswell (_Annals of Paris. Typog._, p. 6.), that signatures were first introduced, anno 1476, by Zarotus, the printer, at Milan? They may doubtless be seen in the _Opus Alexandride Ales super tertium Sententiarum_, Venet. 1475, a book which supplies also the most ancient instance I have met with of a "Registrum Chartarum." Signatures, however, had a prior existence; for they appear in the Mammetractus printed at Beron Minster in 1470 (Meermau, ii. 28.; Kloss, p. 192.), but they were omitted in the impression of 1476. Dr. Co