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About half fill an oil flask with water; put in two or three grains of phosphorus and let the water boil. If this is done in a dark place, balls and jets of fire will be seen shooting about on the surface, affording a very curious spectacle.
134. Phosphorus combines with oxygen in two proportions, forming the phosphorus and phosphoric acids J see acids.
It also unites with hydrogen, forming phosphuretted hydrogen.
Exp. 1. Make a solution of pure potash in water, with which fill a small retort. Put into it a few grains of phosphorus and make the solution boil. Bubbles of phosphuretted hydrogen will be extricated and will take fire, as they come in contact with the air. In making this experiment, care must be taken to fill the retort entirely full of the liquid, otherwise the gas will explode, as it reaches the air in the retort. The mouth of the retort must be dipped in a hot solution of the same liquid. The most convenient way of making the experiment, is to cut a piece of wood in a triangular shape, as in fig. 28; on which the retort is to be fastened, while the beak is immersed in. the hot solution, and the heat of the lamp is applied at the proper place.
2. Pour about two ounces of water into a thin glass vessel, and put into it two drams of granunated zinc, and ten grains of phosphorus cut into small pieces, then add two thirds of an ounce of strong sulphuric acid. This affords a very amusing experiment. Bubbles |of phosphuretted hydrogen cover the surface of the water, taking fire as fast as they reach the air.
135. Phosphorus combines with the fixed alkalies and earths, forming a class of compounds called phosphurets.
Obs. Among those compounds the phosphuret of lime, possesses the curious property of giving out phosphuretted hydrogen whenever it is thrown into water.
Exp. To prepare phosphuret of lime, take a glass tube about 12 inches long and half an inch in diameter, stopped at one end. Put first into the tube about a dram of phospborus, and let it occupy the end that is closed. Then hold the tube horizontally and push into it with a wire, pieces of fresh burned quick lime, about the size of split peas, until it is nearly full, taking care that the lime does not reach the phosphorus by an inch or two ; then stop the mouth of the tube loosely, to prevent the free access of air. Next heat the part of the tube red hot where the lime is, by means of a chafing dish of charcoal, taking care to keep the phosphorus cool ; when the lime is red hot, bring a hot iron, or lamp, under the phosphorus, so as to sublime it and bring the vapor in contact with the red hot lime. The lime and phosphorus will unite and form a compound* of a reddish brown colour. This is phosphuret of lime. If a few grains of it be thrown into a glass of water, bubbles of phosphurretted hydrogen are soon extricated from it, which take fire, with a slight explosion, as fast as they reach the surface, affording except the smell, a very beautiful experiment.

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