Excerpt from The British Pharmacopoeia, 1885
An attempt has been made to introduce a method of setting out the relative quantities of ingredients used in some of the processes by supplementing the respective weights and measures by proportional parts. It was at first proposed that the use of parts should altogether supersede that of specified weights and measures, but it was thought better, at least for-the present, merely to supplement weights and measures by parts where the context permits and where this can be made more clearly to show the proportion which the several parts bear to each other. Wherever this method 'is employed, the term parts signifies parts by weight, and the term fluid parts signifies the volume of an equal number of parts of water.
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