Mrs. Gray.

Dissolve a large lump of Spanish whiting in water which has previously dissolved a teaspoon of washing soda, take only sufficient water to moisten the whiting, and it will become a paste; with a flannel cloth rub the marble well, leaving it on for a while and repeating the process two or three times, if necessary. Wash off with soap and water, then dry the marble well and polish with a soft duster.