This section is from the "Elixirs And Flavoring Extracts. Their History, Formulae, & Methods of Preparation" book, by John Uri Lloyd. Also available from Amazon: Elixirs and flavoring extracts,: Their history, formulae, and methods of preparation;
Sulphate of iron, crystallized, 256 grains.
Bicarbonate of sodium, 200 grains.
Citric acid, distilled water, elixir of calisaya bark (alkaloidal), of each a sufficient quantity.
Dissolve the sulphate of iron and the bicarbonate of sodium separately, each in sixteen fluidounces of cold, freshly distilled water, and mix the solutions. Pour the mixtures into a bottle, which must be filled to the stopper (using more distilled water if necessary), and permit it to rest for twenty-four hours. Decant the clear solution and refill the bottle with freshly distilled water, shaking well, and permit it to stand as before. After twenty-four hours decant the clear solution, pour the residue upon a fine muslin strainer and squeeze the liquid from it. Dissolve the precipitate by trituration in a mortar, with citric acid in sufficient amount, and then add enough elixir of calisaya bark to make sixteen fluidounces, and filter.
Each fluidrachm (teaspoonful) of the finished elixir contains of citrate of protoxide of iron an amount which is equivalent to two grains of crystallized sulphate of iron, and it represents about three grains of calisaya bark.
The name (elixir of protoxide of iron) is a misnomer, if applied to a preparation like this, and all the processes we have seen give a solution of a salt of protoxide of iron. This fact has been repeatedly noticed in the Druggists' Circular and other journals, and such authorities as Mr. Creuse, Prof. Diehl, and Prof. Oldberg have called particular attention to the misnomer. Notwithstanding all of which, we find physicians, and even pharmacists, insist on using the term, and we therefore place it among our synonyms.