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When it is wished to render any of the stains more durable and beautiful, the work should be well rubbed with Dutch or common rushes after it is coloured, and then varnished with seed-lac varnish, or if a better appearance is desired, with three coats of the same, or shell-lac varnish. Common work only requires frequent rubbing with linseed oil and woollen rags. The remainder, with the exception of glass, will be treated in the following sections: [A LAUGHING CHILD IS THE BEST PORTRAIT OF HAPPINESS.] 1414. Alabaster, Marble, and Stone. Alabaster, marble, and stone, may be stained of a yellow, red, green, blue, purple, black, or any of the compound colours, by the stains used for wood. 1415. Bone and Ivory. Black. i. Lay the article for several hours in a strong solution of nitrate of silver, and expose to the light. ii. Boil the article for some time in a strained decoction of logwood, and then steep it in a solution of persulphate or acetate of iron. iii. Immerse frequently in ink, until of sufficient depth of colour. 1416. Bone and Ivory. Blue. i. Immerse for some time in a dilute solution of sulphate of indigo--partly saturated with potash--and it will be fully stained. ii. Steep in a strong solution of sulphate of copper. 1417. Bone and Ivory. Green. i. Dip blue-stained articles for a short time in nitro-hydrochlorate of tin, and then in a hot decoction of fustic. ii. Boil in a solution of verdigris in vinegar until the desired colour is obtained.