The book An Introduction to Science was written by author Bertha May Clark Here you can read free online of An Introduction to Science book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to Science a good or bad book?
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Varnish and shellac should always be applied lightly and allowed to dry thoroughly. If the coating is thick, it dries slowly, sticks, and finally peels off. Lacquer is obtained by dissolving in alcohol or turpentine the sap of a small Japanese tree. Creosote oil for wood blocks. Railroad ties and street paving blocks are protected by a cheap oil rather than by paint. Wood is soaked in creosote oil until it becomes thor- oughly saturated with the oily substance. The pores of the wood are thus cl...osed to the entrance of air and moisture, and decay is avoided. Creosote is poisonous to insects and to many animals, and thus acts as a protection against them. Wood treated with creosote is very durable. Creosote oil is obtained from the destructive distillation of coal and wood. CHAPTER XIX NITROGEN AND ITS RELATION TO PLANTS Nitrogen. A substance which plays an important part in animal and plant life is nitrogen. Soil and the fertilizers which enrich it, the plants which grow on it, and the animals which feed on these, all contain nitrogen or nitrogenous compounds.
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