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Another (Dissolve the best isinglass)

Dissolve the best isinglass in the strongest (glacial) acetic acid.

Bottle Cement.

Resin, 15 parts; tallow, 4 (or wax, 3) parts; highly dried red ochre, 6 parts; or lampblack sufficient to give color. Diamond Cement.

Isinglass, 1 oz.; distilled water, 5 oz.; dissolve and boil down to 3 oz.; add 1 oz. of alcohol, boil for a minute or two. Strain, and while hot add oz. of milky emulsion of gum ammoniac, and 5 drs. of tincture of mastic.

Oxychloride of Zinc Cement.

In liquid chloride of zinc, of 50° to 60° Beaumé, dissolve 3 per cent. of borax or sal ammoniac; add oxide of zinc (zinc white) until the mass is of proper consistence. This cement, when hard, becomes as firm as marble. It may be cast into moulds like plaster, as used in Mosaic work.

Bird Lime.

Boil the middle part of the holly 7 or 8 hours in water; drain it, and lay it in heaps in the ground, covered with stones, for 2 or 3 weeks, till reduced to a mucilage. Beat this in a mortar, wash it in rain-water, and knead it till free from extraneous matters. Put it into earthen pots, and in 4 or 5 days it will be fit for use. An inferior kind is made by boiling linseed-oil for some hours, until it becomes a viscid paste.

Transparent Cement.

Dissolve 75 parts India-rubber in 60 parts of chloroform or benzine, and add to the solution 15 parts of mastic.

Another. Balsam of fir is a strong cement when not exposed to heat. It is to be warmed and applied to the glass, itself previously warmed.

It is used for cementing lenses, mounting microscopic objects, etc., and does very well for broken glass when it is not to be washed in warm water.

The thicker the balsam the stronger, when too thin it may be thickened by gentle evaporation.

To make Paper Water-proof.

Dissolve 8 oz. of alum and 34 oz. of white soap in 4 pints of water; in another vessel dissolve 2 oz. of gum Arabic and 4 oz. of glue in 4 pints of water. Mix the two solutions and make the mixture hot. Immerse the paper in the mixture, and then hang it up to dry or pass it between cylinders. The alum, soap, glue, and gum form a sort of artificial covering which protects the surface of the paper from the action of water, and to a certain extent from fire. This paper will be very useful for packages which may be exposed to the inclemency of the weather.

New Applications for Gun-cotton.

In order to obtain cheap gun-cotton it may be made of rags instead of new cotton. It is first dissolved in any of its solvents, such as ether and alcohol, and becomes collodion. To this is now added any of the purest animal and vegetable oils, and it forms the new liquid which is to be used as a cement and vehicle. By adding to it gums and resins a cement is formed, which may be rolled out into sheets and stamped in dies into cups, fancy boxes, and various other articles. The oxide of copper imparts a green color to it, and the chloride of lime added renders it uninflammable. The addition of fine flax fibre, or the flocks of wool, renders it strong and flexible. It is stated to be an excellent compound for taking