This section is from the book "A Text-Book Of Materia Medica, Pharmacology And Therapeutics", by George F. Butler. Also available from Amazon: A text-book of materia medica, pharmacology and therapeutics.
The imperative singular is employed in the superscription R - i. e., recipe, " take (thou)," and in certain directions to the pharmacist, as misce, "mix"; divide, "divide"; fac, "make"; solve, "dissolve "; etc.
The subjunctive mood, having the force of the imperative, is also used, as quantum sufficiat, " as much as may suffice"; fiat,fiant, " let be made " (as fiat mistura, " let a mixture be made," or fiant in pilulas, " let the ingredients be put into pills ") ; bidliat, " let it boil"; ne repetatur, " do not let it be repeated," " do not repeat"; dividen-dur, " let them be divided," etc.
A future passive participle is also frequently used: dividtndus, like an adjective agreeing with the noun in gender, case, and number, and signifying " to be divided (into)," as in the order in tro-chlscos dividenda (massa), " to be divided into troches."
 
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