Teissier did not learn from Labbé's experience that titles should be cited in the original languages. Consequently, the _Catalogus_ offers the same mixture of Latin titles translated from the vernacular and vernacular titles as we found in the _Bibliotheca bibliothecarum_. Probably he could not have achieved any substantial improvement in this regard. He could not see many books that he cited and the sources from which he took the titles usually gave them in Latin translation. Like Labbé, he cited bibliographical sections of non-bibliographical works.[83] He made some mistakes and corrected some that Labbé had made.[84] His most serious fault is his failure to verify his references. In the seventeen pages devoted to authors whose first names begin with "H" (_Catalogus_, pp. 121-138) Teissier cited eight books with the remark "He is said to have written--(scripsisse dicitur)." This number is much larger than it should be. Since he usually neglects to cite his source (Labbé is more careful in this regard), search for the title may be difficult. He is often careless in details.[85] Teissier did not improve his technique in the _Auctuarium_, a supplement published in 1705. This book of 388 pages contains many new bibliographies and substantial additions to the indexes.[86] He has turned up some new bibliographers of classical times that had escaped Labbé and were not included in his revision of 1686. For example, he cites Xenocrates as the writer of a list of geometricians and Varro as the writer of a list of poets. He has brought up to date the list of English bibliographers by adding Henry Holland, who is the H. H. of the _Herwologia_,[87] Richard Smith, whose library was the subject of an early catalogue; and William Winstanley, who wrote on English poets. He knows "Rossus Warwicensus" from John Pits's biobibliographical dictionary of English authors, but of course has not seen Thomas Hearne's edition, which came out a few years later.[88] He is as neglectful as he had been in the _Catalogus_ about giving dates and places of publication and citing authorities for titles that he has not seen and works in manuscript.