Mix and let macerate together with frequent agitations for 10 days, then percolate, press off, and filter. The yield should be 45 ounces. Of this take 40 ounces and mix with an equal amount of distilled water. Dissolve 6 drachms of sodium phosphate in 5 ounces of boiling water; let cool and add the solution to the filtrate and water, mixing well. Add 2 drachms of calcium chloride dissolved in 5 ounces of water, nearly cold, and again thoroughly shake the whole. Let stand for 12 hours; then filter.
Put the filtrate in a still, and distil off, at as slow a temperature as possible, 30 ounces. Set this distillate to one side, and continue the distillation till another 40 ounces have passed, then let the still cool. The residue in the still, some 18 ounces, is the desired essence. Pour out all that is possible and wash the still with the 30 ounces of distillate first set aside. This takes up all that is essential. Finally, filter once more, through double filter paper and preserve the filtrate—about 40 ounces, of an amber-colored liquid containing all of the essentials of Jamaica ginger.
Soluble Essence of Ginger.—II.—The following is Harrop’s method of proceeding:
| Fluid extract of ginger (U.S.) | 4 ounces |
| Pumice, in moderately fine powder | 1 ounce |
| Water enough to make | 12 ounces |
Pour the fluid extract into a bottle, add the pumice and shake the mixture and repeat the shaking in the course of several hours. Now add the water in proportion of about 2 ounces, shaking well and frequently after each addition. When all is added repeat the agitation occasionally during 24 hours, then filter, returning the last portion of the filtrate until it comes through clear, and if necessary add sufficient water to make 12 ounces.
| III.— | Jamaica ginger, ground | 2 pounds |
|---|---|---|
| Pumice stone, ground | 2 ounces | |
| Lime, slaked | 2 ounces | |
| Alcohol, dilute | 4 pints |
Rub the ginger with the pumice stone and lime until thoroughly mixed. Moisten with the dilute alcohol until saturated and place in a narrow percolator, being careful not to use force in packing, but simply putting it in to obtain the position of a powder to be percolated, so that the menstruum will go through uniformly. Finally, add the dilute alcohol and proceed until 4 pints of percolate are obtained. Allow the liquid to stand for 24 hours; then filter if necessary.
| IV.— | Tincture ginger | 480 parts |
|---|---|---|
| Tincture capsicum | 12 parts | |
| Oleoresin ginger | 8 parts | |
| Magnesium carbonate | 16 parts |
Rub the oleoresin with the magnesia, and add the tinctures; add about 400 {315} parts of water, in divided portions, stirring vigorously the while. Transfer the mixture to a bottle, and allow to stand 1 week, shaking frequently; then filter, and make up 960 parts with water.
| V.— | Fluid extract of ginger (U. S. P.) | 4 ounces |
|---|---|---|
| Pumice, powdered and washed | 1 ounce | |
| Water enough to make | 12 ounces |