পাতা:পদার্থবিদ্যাসার.djvu/৬৩

52 Pop. Are there any, other valuable things to be found in the earth : Tut. Quicksilver, chalk, brinastone, limestone, salt, clay for bricks, earthen-ware, &c.—Stone, , marble, chrystals, diamonds, and magnets or loadstones which are so useful in navigation. * Pup. i should wish now, if you please, to turn toy thoughts from the land to that body of water, the sea. What is worthy my observation'there? Tut. Its extent, its dep1h, its sothess, its ebb and flood, and its limits or boundary. Pup. Why is it so extensive ? Tut. For wise purposes, no doubt. It is a grand reservoir of water, from which millions of tons are rais... ed up by the warmth of ثلا sun, to form clouds and lain, to supply the whole carth with water. Pap. There seems tliem a continual eirculation ii, the material world, as there is in the animal body. Tut. Precisely so. The rain forms the springs, the . springs form the rivers, the rivers ruu into the sea. The sea furnishes the rising vapours, the vapours form clouds, and the clouds give the rain, This reciprógal succession began with the creation, and will continue to the end of the world. Pup, ' What is it then that produces petrifaction? Tut. According as water is impregnated with stone, * copper, &c. any body deposited in it, wili in the course of time, become petrified, by participating of the same qualities. ' ' Pup. Will yoa have the kindness to describe to me more particălarly, how rivers are formed * x % y wo . -*. ', 's * : , , , , , o, . .