Translation of the
New London Pharmacopœia
by J. Birkbeck Nevins, M.D., 1851
Longman, Brown, Green and Longmans
TROY
The pound 
= twelve ounces 
The ounce 
= eight drachms 
The drachm 
= three scruples 
The scruple 
= twenty grains 
LIQUID MEASURE
The gallon 
= eight pints 
The pint 
= twenty fluidounces 
The fluidounce 
= eight fluidrachms 
The fluidrachm 
= sixty minims 
AVOIRDUPOIS
Dublin College discarded Troy and now employs Avoirdupois (1851).
The pound 
= 16 ounces = 7000 grains
The ounce = 8 drachms = 437.5 grains
The drachm = 3 scruples = 54.68 grains
The scruple =18.22 grains
[BACK]