Precipitated phosphate of calcium, 128 grains.

Simple elixir, lactic acid, hydrochloric acid, ammonia water, distilled water, of each a sufficient quantity.

Mix the precipitated phosphate of calcium with sixteen fluidounces of cold distilled water, and add enough hydrochloric acid to dissolve it. Filter this solution and mix with its bulk of cold water, and then add ammonia water until in slight excess. Transfer the mixture to a fine muslin strainer, and when the liquid has drained return the magma to the vessel, mix it with the amount of water before employed, and again transfer it to the strainer. As soon as the magma is again drained, transfer it to a mortar and dissolve it by the addition of a sufficient amount of lactic acid. Filter this, and add enough simple elixir to produce sixteen fluidounces.

Each fluidrachm (teaspoonful) of the finished elixir contains one grain of lactophosphate of calcium.