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------- |o o| Five | o | Grains |o o| ------- 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 [*scruple]ss, which means half a scruple; [*drachm]ss, meaning half a drachm; and [*ounce]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. 663. Measures.--Liquid Liquid medicines are always measured by the following table: 60 minims......... \ / 1 fluid drachm. 8 fluid drachms | are | 1 fluid ounce. 20 fluid ounces... | contained | 1 pint. 8 pints.......... / in \ 1 gallon. And the signs which distinguish each are as follows:--c. means a gallon; o a pint; fl [*ounce], a fluid ounce; fl [*drachm], a fluid drachm; and m, a minim, or drop. Formerly drops used to be ordered, but as the size of a drop must necessarily vary, minims are always directed to be employed now for any particular medicine, although for such medicines as oil of cloves, essence of ginger, &c., drops are frequently ordered. 664. Specific Measuring Vessels. In order that Medicines may be measured Accurately, there are graduated glass vessels for measuring ounces, drachms, and minims. 665. Approximate Measures. When proper measures are not at hand, it is necessary to adopt some other method of determining the quantities required, and therefore the following table has been drawn up for that purpose: