PHARMACEUTICAL FORMULAS A BOOK OF USEFUL RECIPES FOR THE DRUG TRADE
COMPRISING FORMULAS FOR TOILET PREPARATIONS AND SPECIALITIES
PREPARATIONS FOR THE HAIR DENTIFRICES PERFUMES HOUSEHOLD AND
CULINARY REQUISITES BEVERAGES ANTISEPTICS AND DISINFECTANTS INKS
VARNISHES CONFECTIONERY MEDICINAL COMPOUNDS AND MANY OTHER
PREPARATIONS RELATED TO THE ART OF PHARMACY COLLATED CHIEFLY FROM
THE CHEMIST AND DRUGGIST AND THE CHEMISTS AND DRUGGISTS DIARIES
WITH ANNOTA T ZOS BY PETER MAC EWAN, F.C.S. PHARMACEUTICAL CHEMIST
OF THE CHEMIST AND DRUGGIST EDITORIAL STAFF EDITORIAL NOTE THIS is
a book which has been asked for many times during the past twenty
years. Chemists who have found a formula from The Chemist and
Druggist pay, their subscription over and over again have
frequently suggested to the Editor that the whole of such formulas
should be gathered together and published as a book. When these
suggestions were accepted, and the work of collating commenced, it
was seen that the task was formidable, because of the enormous
number and varied quality of the formulas to be dealt with. A
goodly proportion of the formulas had to be proved, and the results
of the provings are partly embodied in the book. In some cases they
show stock and traditional formulas to be useless. It is hoped that
the annotations will be helpful to intelligent compounders, and
that the hints in regard to packing, labels, and the like will
assist retailers. One feature of the book is that the contents are
in a great measure based upon requests from more than a generation
of pharmacists for assistance in supplying articles for which they
could discover no recognised formulas. Thus is it that the
correspondence columns of such a journal as The Chemist and
Druggist are a fair index to the everyday wants of the trade, and
the best of the replies in fifty volumes have been concentrated
into the book. The information so collated has been as far as
possible checked by experiment and reference to the original
sources, and supplemented by private formulas which have been
abundantly proved in practice. The book is not a treatise on
practical pharmacy it is assumed that those who use it are
acquainted with pharmaceutical manipulation, and understand the art
and mystery underlying such expressions as M.S.A The customary
signs employed in prescriptions are, with few exceptions, used in
the formulas, but it is well to note, as opinions differ in the
matter, that their equivalence is as follows - a a scruple of 20
grains. 3 a drachm of 60 glains, or 60 minims. 5 an ounce of 4373
grains, or 480 minims. lb. a pound of 16 ounces. 0 a pint of 20
ounces. Cong. a pllon of 8 pints. The British rule, Solids by
weight, liquids by measure, applies throughout, unless where
otherwise stated. Care has been taken to modify continental
formulas according to this rule. This is important in dealing with
liquids, and is too frequently neglected, with the result that
British compounders fail to produce preparations like the
originals. For example, a mixture of I part of syrupy phosphoric
acid and 10 parts of rectified spirit in a German formula should be
put as 0.66 part and 12 parts respectively in an English one,
because the specific gravity of the acid is 1.500 and of the spirit
0830. The strength of the mixture is I in 11 by weight or I in 19,
by measure. In the case of forrnulas which have originated in the
United States, and which contain the pint, it has to be remembered
that 16 oz. not 20 oz is implied. Failure to recognise these and
similar differences in practice is largely responsible for the
propagation of a host of unworkable formulas In some instances the
selection of formulas for specific articles may seem unnecessarily
liberal. It stands to reason that a retailer does not require,
e.g...
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