Camphor has been used in the manufacture of candles. For this purpose, it is dissolved in brandy, and the wick, composed of equal parts of cotton and linen, is dipped in. It is then dried, and covered, in the usual manner, with tallow or wax. The tallow, recommended as the best for candles, is a combination of equal parts of mutton and beef suet. Camphor is very soluble in acetic acid, which is highly inflammable. This solution is decomposed by water. When combined with essential oils, it forms aromatic vinegar. Romieu has observed that small pieces of camphor floating on water have a rotary motion. Camphor enters into a composition, which is used to determine, like a barometer, the state of the weather, and the changes it undergoes. According to the _Journal de Pharmacie_, 1815, some experiments were made in France on the fluid taken out of one of the English weather gauges. The liquid contained water and alcohol, was strong with camphor, and reddened litmus paper. The tube contained 3-1/2 ounces. On analysis, its contents were found to be, 24 grains of alum, 120 grains of camphor, and enough water to dissolve the former, and alcohol to dissolve the latter. A similar composition was made, and put into a tube, which, it seems, had the same effect. The tube is hermetically sealed. M. Cadet observes, that the _prognosticator_, made in Paris many years ago, was a similar preparation. Although, according to Cadet, this contrivance cannot be depended upon, as the appearances it presents are not regular; yet, as the effect is produced by heat, as well as light and electricity, the following summary may be added: 1. In fair weather, the composition remains at the bottom, and the liquor is clear. 2. Before rain, it will rise a little; the liquor will be clear, having merely a star floating in it. 3. Before a storm, it will rise to the surface, the liquor will appear troubled. These appearances may be seen 24 hours before the change in the weather takes place. 4. In winter, it is higher than common. During a snow, it will be very white, and pieces are seen in motion. 5. In settled weather in summer, and when warm, the composition will be low. 6. To know from what quarter wind will come, the composition will remain attached on the opposite side of the bottle to that from which it is expected. Camphor has been burnt, like ether and alcohol, by platinum wire, previously heated. Dr. Ure observes, that a cylinder of camphor may be used for both wick and spirit, in the aphlogistic lamp; and the ignition is very bright, while an odoriferous vapour is exhaled. By adding various essential oils in small quantities to the alcohol of the lamp, various _aromas_ may be made to perfume the air of an apartment. See _Scented Fires for rooms_.