'Geirfynag i Weithiau William Salesbury', being a holograph index by John Peter ('Ioan Pedr'), Bala to the herbal 'Llysieulyfr Meddyginiaethol' contained in NLW MS 686. The index is dated 5 April 1873 and appears to be a fair copy of the one, also in John Peter's hand, contained in NLW MS 2606. The title-page suggests that the scribe had intended also to re-copy the index to William Salesbury and Henry Perry: Egluryn Phraethineb... (London, 1595) which is contained in NLW MS 2606, but this work has not been included.