. Lessons in nature study. Nature study. 96 NATURE STUDY tnucli less readil}', the water taking up but a small amount of the substance. There are other liquids such as the acids and alkalis which will dissolve substances which water will not dissolve, but the solvent power of water is sufficient for illustration of the facts of solution,and it is water with which we have the most to do. Test-tubes are the most satisfactory vessels in which to make the solutions, but bottles or drinking glasses will answer very well. After making solutions we may follow with lessons on the regaining of the diss
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. Lessons in nature study. Nature study. 96 NATURE STUDY tnucli less readil}', the water taking up but a small amount of the substance. There are other liquids such as the acids and alkalis which will dissolve substances which water will not dissolve, but the solvent power of water is sufficient for illustration of the facts of solution, and it is water with which we have the most to do. Test-tubes are the most satisfactory vessels in which to make the solutions, but bottles or drinking glasses will answer very well. After making solutions we may follow with lessons on the regaining of the dissolved substances from the solutions. That is done, of course, by evaporating the water which leaves the sub- stance in solution behind. This is most rapidly done by heating the water to boiling, when it quickly passes away. All the sub- stances above suggested should be regained from their solu- tions. Sugar dissolved in water exists in beets, in sugar-cane or in the sap of maple trees. The juices are extracted and "boiled down, " that is, the water is .^. Fig, 69. Apparatus for obtaiuiug crystals on strings. evaporated away and molasses or sugar is left. When a substance is re- gained trom solution by the rapid process of boiling it is left behind generally in the form of a fine powder of very minute crystals. If, -however, we allow the evaporation to go on slowly, as in an open vessel in the temperature of the school-room, then the dissolved substance will form into large, beautiful crystals. If strings or slender sticks are suspended in the liquid the. 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 work.. Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. joint author. San Francisco, The Whitaker & Ray Company