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There are 20 grains to a scruple, 3 scruples to a dram (or “8-ball”), and 8 drams to the ounce. The following table shows the unusual symbols used in the prescriptions. If the symbols for dram, ounce and scruple display as squares or similar, the reader’s web browser needs to be set to a different default font, such as Lucida Sans Unicode. Alternatively, if the pointer is placed over these items later on in the text, a text definition will appear: