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The attention of medical men was directed at this time to the action of limewater as a remedy for stone in the bladder.

In using bicarbonate of soda, a much less quantity brings about the desired result, 1½ grains of bicarbonate of soda being equal to one ounce of limewater.

Treatment.—For a superficial burn use a mixture of equal parts of limewater and linseed oil, or common white paint—white lead ground in oil—to exclude the atmosphere and protect the inflamed skin.

It can be detected by the limewater test.

This will probably always leave some lime in the bottom of the vessel, since limewater is a saturated solution, and these proportions furnish more lime than is necessary.