Some time between the summer of 1490 and the spring of 1492 the late fifteenth-century humanist Bartolommeo della Fonte (or, as he is frequently called, Fontius) wrote his De poetice ad Laurentium Medicem libri III. In 1960, as an appendix to my study of the inaugural orations of Fontius, I published the hst of his works compiled by his student Francesco Pandolfini shortly after the death of Fontius in 1513. To this I added a list of all the locations of these works, both manuscript and printed, that I could discover, including some not listed by Pandolfini. Shortly thereafter (in January 1961) I received a note from Professor E. H. Gombrich, director of the Warburg Institute, telling me that he had seen a manuscript of one of the unlocated items on the Pandolfini list (my number 33), namely Fontius' Poetics.