| Age— | Years | 80 | 65 | 50 | 25-40 20 | 16 | 12 | 8 | 5 | 2 |
| Doses | 5⁄8 | 3⁄4 | 7⁄8 | 1 | 7⁄8 | 3⁄4 | 5⁄8 1⁄2 | 3⁄8 | 1⁄4 | |
| ” | Months | 12 | 6 | 2 | 1 | |||||
| Doses | 1⁄5 | 1⁄8 | 1⁄15 | 1⁄24 |
DOUCHE. [Fr.] Syn. Douche bath. A species of bath much employed by hydropathists, both for the relief of local affections, and to give a healthy stimulus to the whole system. The douche consists of a single jet of cold water, varying in size from the thickness of a quill to that of a man’s arm; it is projected with great force, either from above, below, or on one side, upon a particular part of the body. See Bath (Shower).
DOUGLAS′ DISINFECTING POWDER. A mixture of sulphite of calcium, chalk, and carbolic acid, or of sulphite and carbonate of lime.
DOVER’S POWDERS. See Powder.
DRAB DYE. 1. (For cotton.) For 40 lbs. Boil 6 lbs. of fustic; scald 21⁄2 lbs. of Lima wood and 2 lbs. of sumach. Decant into a wooden vessel, capable of containing 100 gallons; reduce with cold water to handling heat; enter, 6 turns; wring out; sadden with 8 ounces of copperas; 4 turns; wring out again, and give 4 ounces of bluestone.
2. (For silk.) For 100 yards. Boil 4 lbs. of fustic and 6 ounces of logwood, 21⁄2 ounces of cudbear, 11⁄4 ounce of copperas. Cool to 200° Fahr.; enter, winch 20 minutes; air out; repeat; then take a little of the liquor out of the boiler, dissolve the copperas, reduce it to handling heat with water, and give one or two shots through it, as the pattern requires; one water out of the saddening; then give a warm but weak sour to clear the colour, wash in two waters, and dry.
3. (For Wool.) Dark drab. For 50 lbs. 7 lbs. of fustic, 8 ounces of madder, 4 ounces of cudbear, 2 lbs. of alum, 8 ounces of tartar. Enter between the cold and 160° Fahr.; after heating up boil from 10 to 30 minutes; wash in two waters. All dark shades of this may be slightly prepared with chrome; wash in two waters.
4. (For wool.) Light drab. For 56 lbs. 4 lbs. of fustic, 13⁄4 lb. of alum, 4 ounces of madder, 4 ounces of tartar, 31⁄2 ounces of cudbear. Work as for dark drab.
DRACONINE. Syn. Dra′cine, Red resin of dragon’s blood. A peculiar vegetable principle discovered by M. Melandre in dragon’s blood.
Prep. Dragon’s blood is dissolved in alcohol, the solution filtered, concentrated, and precipitated with cold water; the red, spongy precipitate is well washed, neutralised with dilute sulphuric acid, again liberated by means of an alkali, and well washed with water.