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Some of these bodies are soluble,Nike Kobe 9 Elite High-Top Męskie, e.g. natron,Moncler Hatt, some insoluble, e.g. pottery: of the latter, some, like horn,Belstaff New Panther Jackor, can be softened by heat, others, like pottery and stone, cannot. The reason is that opposite causes have opposite effects: consequently,Ralph Lauren Tillbehör, if solidification is due to two causes, the cold and the dry, solution must be due to the hot and the moist, that is, to fire and to water (these being opposites): water dissolving what was solidified by fire alone,Chaussures NMD Human Race, fire what was solidified by cold alone. Consequently,Maillot Nolito Pas Cher, if any things happen to be solidified by the action of both, these are least apt to be soluble. Such a case we find where things have been heated and are then solidified by cold. When the heat in leaving them has caused most of the moisture to evaporate, the cold so compacts these bodies together again as to leave no entrance even for moisture. Therefore heat does not dissolve them (for it only dissolves those bodies that are solidified by cold alone), nor does water (for it does not dissolve what cold solidifies, but only what is solidified by dry heat). But iron is melted by heat and solidified by cold. Wood consists of earth and air and is therefore combustible but cannot be melted or softened by heat. (For the same reason it floats in water-all except ebony. This does not,Belstaff Brian Lång Jackor, for other kinds of wood contain a preponderance of air,Parajumpers Kobiety Simona, but in black ebony the air has escaped and so earth preponderates in it.) Pottery consists of earth alone because it solidified gradually in the process of drying. Water cannot get into it, for the pores were only large enough to admit of vapour escaping: and seeing that fire solidified it, that cannot
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