MEDICAL SIGNS AND ABBREVIATIONS._The American Printer: A Manual of Typography Containing practical directions for managing all departments of a printing office, as well as complete instructions for apprentices; with several useful tables, numerous schemes for imposing forms in every variety, hints to authors, etc.

℞ stands for _Recipe_, or Take.

ā, aa, of each a like quantity.

℔ a pound.

℥ an ounce.

ʒ a drachm.

℈ a scruple.

j stands for 1; ij for 2; iij for 3; and so on.

ss. signifies _semi_, or half.

gr. denotes a grain.

P. stands for _particula_, a little part, and means so much as can be

taken between the ends of two fingers.

P. æq. stands for _partes æquales_, or equal parts.

q. s. _quantum sufficit_, or as much as is sufficient.

q. p. _quantum placit_, or as much as you please.

s. a. _secundem artem_, or according to art.

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