i
. The grain weights are marked by little circles, thus:
Each of the grain weights, in addition to the circles denoting their several weights, bears also the stamp of a crown. Care must be taken not to mistake this for one of the numerals. Besides these weights there are others marked
ss, which means half a scruple;
ss, meaning half a drachm; and
ss, meaning half an ounce. When there are ounces, drachms, or scruples, the number of them is shown by Roman figures, thus:—i. ii. iii. iv. v., &c., and prescriptions are written in this style.