A pleasant, cooling, summer drink. The blue paper contains carbonate of soda, thirty grains; the white paper tartaric acid, twenty-five grains.

Directions. - Dissolve the contents of the blue paper in half a tumbler of water, stir in the other powder, and drink during effervescence.

Soda powders furnish a saline beverage, which is very slightly laxative, and well calculated to allay the thirst in hot weather.

One pound of carbonate of soda, and thirteen ounces and a half of tartaric acid, supply the materials for 256 powders of each sort.