Lessons On Objects, Graduated Series; Designed for Children Between the Ages of Six And Fourteen Years;
The book Lessons On Objects, Graduated Series; Designed for Children Between the Ages of Six And Fourteen Years; was written by author Elizabeth Mayo Here you can read free online of Lessons On Objects, Graduated Series; Designed for Children Between the Ages of Six And Fourteen Years; book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lessons On Objects, Graduated Series; Designed for Children Between the Ages of Six And Fourteen Years; a good or bad book?
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Pupils. — ^The gum, contrary to the sealing wax, dis- solves in the water, but not in the spirit ; it is also soluble and insoluble. Teacher. — It is so ; but when no particular solvent is named, it is always understood to be water ; hence, in or- dinary language, gum is said to be soluble ; sealing wax insoluble; the solvent, water, being understood. India rubber is an example of a solid, insoluble in all ordinary liquids, but soluble in coal tar, naphtha; the solution thus obtained is used fo...r making waterproof (Macintosh) cloth- ing, by employing it to cement together two thin layers of cloth. The pupils then should be required to mention all the 198 FOUETH STEP. LESSON XXXIII. new terms they have learnt, or any like them ; as soluble, insoluble, solve, solvent, solution, dissolve, dissolving, solu- bility, insolubility, saturated. Teacher. — -Do you observe a resemblance in these words ? Pupils, — Yes ; they all, except saturated, have solve or solu in them. Teacher. — ^The meaning of that root, as it is called (for it is like the root of a plant, the part from which the other parts spring), is to loose ; it comes from a Latin word solvo^ to loose — the v being changed into u ; the word sol- uble then means, being able to be loosed, or to have parti- cles separated by the action of a liquid.
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