1. Sulphur 10 1/2, nitrate of baryta 62 1/2, chlorate of potash 23 1/2, sulphuret of arsenic 1 3/4, charcoal or lamp black 1 3/4; mix.

2. Sulphur 13, nitrate of baryta 77, chlorate of potash 5, metallic arsenic 2, charcoal 3; mix.

3. Nitrate of baryta 20, sulphur 1 1/2, sulphuret of antimony 1/2, chlorate of potash 10, charcoal 1/4; mix.

4. Nitrate of baryta 10 1/2 drs., sulphur 2 drs., chlorate of potash 162 grs., lamp black 26 grs.; mix.

5. Dry nitrate of baryta 12 parts, sulphur 4, dry and finely-powdered chlorate of potash 5 parts. The chlorate to be mixed by a horn spatula.

*** To guard against the danger sometimes arising from the spontaneous combustion of coloured fires containing sulphur and chlorate of potash, Mr. Saunders recommends intimately mixing 120 grains of powdered bicarbonate of potash with each pound of sulphur before using it in the manufacture of any composition into which chlorates enter. Coloured Flame Papers. Soak Swedish filtering paper for ten minutes in a mixture of 4 parts of oil of vitriol with 5 parts of strong nitric acid, both by measure. When the strips are removed from the acid they must be thoroughly washed, first with cold, then with hot rain or distilled water, till the washings cease to be acid. Then make different solutions (not too strong) of such of the chlorates of the metals as give the desired flame reactions, make them slightly warm, and saturate the papers separately with them.

Dry the papers before the fire previous to lighting them. They show to best advantage when a slip is loosely crumpled up into a pellet, lighted quickly art; one corner, and thrown into the air against a dark background. Paper prepared with a salt of potassa will give a violet flame; that with soda a yellow one, that with baryta a green, and that with strontian a crimson. Coloured Flames. The flame of alcohol may be coloured, by mixing certain salts with the spirit. A green colour is given by chloride of copper, or boracic acid; red by nitrate of strontian, nitrate of iron, or nitrate of lime; yellow by-nitrate of soda, etc.