Even before his death, the Liège physician seems to have confessed to a share in the circulation of, and additions to, the work. In the common Latin abridged version of it, at the end of c. vii., the author says that when stopping in the sultan's court at Cairo he met a venerable and expert physician of "our" parts, but that they rarely came into conversation because their duties were of a different kind, but that long afterwards at Liège he composed this treatise at the exhortation and with the help ("Jiortatu et adiutorio") of the same venerable man, as he will narrate at the end of it.