Elements of pharmacy, materia medica, and therapeutics. / By William Whitla.
- William Whitla
- Date:
- 1882
Licence: Public Domain Mark
Credit: Elements of pharmacy, materia medica, and therapeutics. / By William Whitla. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![the dropping has conchuled the stopper is taken alto- gether out for an instant to allow the liquid accumulated about the neck to flow back again into the bottle before the stopper is thrust home ; various bottles, with patent stoppers, have been devised to facilitate dropping ; but, as a rule, every requirement is met by the above plan. The student should remember that a drop is a vague and indetinite quantity, supposed to be identical with a minim, wliich it seldom is. Elaborate tables have been prepared, showing how many drops of certain liquid preparations are found to correspond with one dram ; thus it is generally stated that there are 120 drops of tincture of digitalis or opium in one fluid dram, and 45 of prussic acid in the same bulk. It is, however, well known that the number and size of the drops depend, not so much upon the nature of the liquid, as upon some accidental cir- cumstances—as the shape and size of the stopper, or especially the shajje of the Up of the lottlc, and how much wet or moisture is about it, &c., &c. The system of ordering drops should be entirely given up, and miuims directed to be mea- sured instead, unless when two or three drops of a flavouring essence are ordered in a mixture. CHAPTER III. MIXING OK MIXTURK MAKING, Under the term mixture in Pharmacy is included every extemporaneous fluid compound intended for internal use, except a few bearing distinctive names—as draughts or enemata. It would be difficult to give such general direc- tions to the dispenser as would equally ap])ly to the pre- ))aration of so many really different compounds as solutions, emulsions, decoctions, fee. ; but a little practical experience will soon show him how lie may apply the knowledge gained in making one cia.ss of preparations to aid him in com- pounding another. Mixtures are onlered and dispensed in 2, ,'!, 4, C, 8, 10, and 12 ounce bottles, and occasionally in Hi or 20 ounce; and taking the simplest form oF mixture, where two or more fluid](https://iiif.wellcomecollection.org/image/b21507296_0025.jp2/full/800%2C/0/default.jpg)
