Volumes from The Pharmacy, Peveril, Holyhead Road, Llanfairpwll. The notebooks contain recipes for prescriptions. The symbol is used for a drachm, a unit of weight formerly used by apothecaries it is:
= to 60 grains or an eighth of an ounce.
= to 60 minims or an eighth of fluid ounce.
The ounce symbol is = to apothecaries 437.5 grains