It is not wise for the inexpert housewife to trust to unscientific friends for advice as to the best materials to use when cleaning paint. A foreman painter once gave, as a recipe for this purpose, an instruction to add a tablespoonful of "salts of tartar" to three-quarters of a pailful of water. The result was a very rapid and complete removal of dirt from the paint, but the housewife, being dissatisfied with the rather dull appearance of the white varnish, stroked it with her finger and found that it was covered with a fine white powder. The maid's assurance that this was all right and only needed to be removed by dusting did not satisfy her, and she began to wonder what chemical action was to be expected from "salts of tartar." A first search for information revealed that salts of tartar was an old name for "potassium carbonate," but the housewife knew no chemistry and had never heard of potassium carbonate, so this information was useless to her. She had, however, had some scientific training and was not satisfied to rest in ignorance. A search in a book on elementary chemistry disclosed the further truth that the commercial name for "potassium carbonate" is pearlash! She then remembered that being desirous at one time to remove the paint from some oak carving said to be two hundred years' old, she had successfully used a solution of pearlash painted on with a brush. The paint when dry from the application had been scraped off in long, tough ribbons. Of course the mixture had been very much stronger than that prescribed by the painter, but the effect had been very much more apparent. Acids and alkalies are to some extent responsible for the fading of fabrics in the wash when these fabrics owe their colour to vegetable dyes. Acids turn vegetable blues red, alkalies turn vegetable blues green and vegetable yellows brown. It is easy to illustrate this action of acids and alkalies on vegetable colours. A blue liquid can be obtained by boiling a red cabbage in water. If we take two portions of this water and add any acid, say lemon-juice, to one portion we shall obtain a red liquid; if we add any alkali, say soda, to the other portion we shall obtain a green liquid. If we go a step further and add lemon-juice to the green liquid and soda to the red liquid we may approach very nearly to our original blue liquid. These experiments suggest a remedy for the change of colour in fabrics on washing with soda, but the dyes most commonly used are not vegetable dyes, and the fading of the fabrics is due to chemical changes, into which we have no space to enter. Strong acids and alkalies act as caustics; that is they destroy fabrics. Continued washing in strong soda and water not only tends to destroy, but also spoils the appearance of all kinds of wearing apparel and household linen. White silk and wool at once become yellow on being washed with soap that contains free soda, and linen is affected in the same way though not to the same extent.