found: His Chymica rationalis, or, The fundamental grounds of the chymical art, 1692:t.p. (W. Y-Worth) p. [13], first group (W. Y-Worth, geboortigh tot Shipham & Borger van Rotterdam)
found: His A new treatise of artificial wines, or, A Bacchean magazine, 1690:t.p. (W.Y.)
found: UnM/Wing files:(hdg.: Y-Worth, William; usage: W.Y.; W. Y-Worth; variants: W. I-Worth)
found: LCCN 08-36343: His Introitus apertus ad artem distillationis, 1692(hdg.: Y-Worth, William; usage: W. Y-Worth)
found: Renaissance and revolution, 1993:p. 174 ("... the Dutchman William Yworth or Yarworth (c. 1650/60-c. 1710), a pharmacist, chemist, and alchemist who also appears to be responsible for the pseudonymously published tracts of 'Cleidophorus Mystagogus' (i.e. the 'Key-Bearing Teacher of the Mysteries') p. 181-182 ("In his pamphlets, Yworth chose -- in addition to the initials 'W. Y.' -- the forms 'Y-worth' or 'Y.worth'; in manuscript he preferred 'Yworth', and only once applied the spelling 'Yarworth'. His son Theophrastus, too, made use of the form 'Y-worth/Yworth'. If the family's origin in the Netherlands is taken into account, one may think of variations such as 'Ijword', Ijwaard(e)', or 'Ijvaert'. Although direct proof is still lacking, what -- at first sight -- appears to be a code name may actually be an Anglicization of a genuine Dutch name.")
notfound: DNB.