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.

by Thomas MacKellar

* Used in Roman Catholic prayer-books to denote the place in a single verse where the response begins.

MEDICAL SIGNS AND ABBREVIATIONS.

℞ 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.