British Library MS. Royal 12 G. iv. 226 folios. Vellum. 330x228mm. 14th-15th Centuries. 11. f163v [Alchemical note with ten hexameter verses on the transmutation of quicksilver into silver.] [Begins] : 'Ad declarandum textum versuum infrascriptorum respicias librum aureum qui dicitur ortus sapientie et thesaurus philosophorum'.