Part 412

SILVER-PLATING: See Plating.

SILVER, RECOVERY OF PHOTOGRAPHIC: See Photography.

SILVER SOLDERS: See Solders. {643}

SILVER, TO CLEAN: See Cleaning Preparations and Methods.

SILVER, TO RECOVER GOLD FROM: See Gold.

SILVERWARE POLISHES: See Polishes.

SIMILOR: See Alloys.

SINEWS, TREATMENT OF, IN MANUFACTURING GLUE: See Adhesives.

SYRUP (RASPBERRY): See Raspberry.

SYRUPS: See Essences and Extracts.

SIZING: See Adhesives.

SIZING WALLS FOR KALSOMINE: See Kalsomine.

SKIN-CLEANING PREPARATIONS: See Cleaning Preparations and Methods.

SKIN OINTMENTS: See Ointments.

SKIN FOODS: See Cosmetics.

SKIN TROUBLES: See Soap.

«SLATE:»

«Artificial Slate.»—The artificial slate coating on tin consists of a mixture of finely ground slate, lampblack, and a water-glass solution of equal parts of potash and soda water glass (1.25 specific gravity). The process is as follows:

I.—First prepare the water-glass solution by finely crushing equal parts of solid potash and soda water glass and pouring over this 6 to 8 times the quantity of soft river water, which is kept boiling about 1 1⁠/⁠2 hours, whereby the water glass is completely dissolved. Add 7 parts finely crushed slate finely ground with a little water into impalpable dust, 1 part lampblack, which is ground with it, and grind enough of this mass with the previously prepared water-glass solution as is necessary for a thick or thin coating. With this compound the roughened tin plates are painted as uniformly as possible. For roofing, zinc plate may be colored in the same manner. The coating protects the zinc from oxidation and consequently from destruction. For painting zinc plate, however, only pure potash water glass must be added to the mixture, as the paint would loosen or peel off from the zinc if soda water glass were used.

II.—Good heavy paper or other substance is saturated with linseed-oil varnish and then painted, several coats, one after another with the following mixture:

Copal varnish 1 part Oil of turpentine 2 parts Fine, dry sand, powdered 1 part Powdered glass 1 part Ground slate 2 parts Lampblack 1 part

SLIDES FOR LANTERNS: See Photography.

SLUGS ON ROSES: See Insecticides.

SMARAGDINE: See Alcohol (Solid).

SMUT, TREATMENT FOR: See Grain.

«SNAKE BITES.»

About 25 years ago, Dr. S. Weir Mitchell and Dr. Reichert published results of their investigations of snake venom which indicated that permanganate of potassium may prove of material value as an antidote to this lethal substance. Since that time permanganate has been largely used all over the world as a remedy when men and animals were bitten by poisonous snakes, and Sir Lauder Brunton devised an instrument by means of which the permanganate may be readily carried in the pocket, and immediately injected into, or into the neighborhood of, the wound. Captain Rodgers, of the Indian Medical Service, recently reported several cases treated by this method, the wounds being due to the bites of the cobra. After making free crucial incisions of the bitten part, the wound was thoroughly flushed with a hot solution of permanganate of potassium, and then bandaged. Recovery occurred in each instance, although the cauterant action of the hot solution of permanganate of potassium delayed healing so long that the part was not well for about 3 weeks. About 12 or 13 years ago, Dr. Amos Barber, of Cheyenne, Wyoming, reported cases in which excellent results had followed this method of treatment. {644}

«Soaps»