. Elementary physics and chemistry: first stage. Science. CRYSTALS AND CRYSTALLISATION—Continued. PRACTICAL WORK. Things required.—Crystals of washing-soda, sugar candy, borax, rock-crystal, blue vitriol, rock-salt, and alum. Flasks. Sand-bath. Laboratory burner. Tripod stand. Blotting paper. Magnify- ing glass. Evaporating basin. Sulphur. Iron spoon. Test-tubes. What to do. Evaporate a solu- tion of common salt by gently heating it, and, when the basin is dry, examine a little of the residue. Care- ful inspection will discover small cubes, the shape of some of which can be recognised by the u
. Elementary physics and chemistry: first stage. Science. CRYSTALS AND CRYSTALLISATION—Continued. PRACTICAL WORK. Things required.—Crystals of washing-soda, sugar candy, borax, rock-crystal, blue vitriol, rock-salt, and alum. Flasks. Sand-bath. Laboratory burner. Tripod stand. Blotting paper. Magnify- ing glass. Evaporating basin. Sulphur. Iron spoon. Test-tubes. What to do. Evaporate a solu- tion of common salt by gently heating it, and, when the basin is dry, examine a little of the residue. Care- ful inspection will discover small cubes, the shape of some of which can be recognised by the unaided eye. The cubical shape of the others can be easily made out under a magnifying glass. Heat some of the dry powder in a test- tube. Notice the crackling and the absence of water on the side of the tube. Fk;. group of fresh crystals of washing-soda. Notice how clear the crystals are. (From a photograph by Mr. H. E. Hadley.) Make a hot satur- ated solution of soda, just as you did in the case of the alum in. 87.—The .same croup of crystals as in Fig. 86, which have effloresced after exposure to the air for a short time. Notice the changed appearance. (From a photograph by Mr. H. E. ). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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