পাতা:পদার্থবিদ্যাসার.djvu/১১৩

102 we see almost every hour, and, therefore, like most other things that are connon, it escapes our notice. Pup. Our motion upon the earth from one place to another, with so much ease, and this too almost without our thinking of it, might well extite our admiration at the wisdom of our Creator : but the motion of birds in the air is still more surprising ; and long to know something farther of the structure of their wings, and in what manner they move and suspend theirselves in the air. Tut. I am glad to find in you an increasing desire of knowledge; but this, with many other things which we have only just touched upou, you will be better able to co:uprehend a few years hence. Pup. l tliamk you ; but pray teli me more uow. Tut. You were just observing, that you are much pleased with the singing of birds; and does it not strike yon with admiration too, that the tender throats of such small creatures, and those of the male porticularly, should be able te form such shrill and various notes: while a great ox or bull can only bellow and roar! It is observable farther, that as they have to fly through the woods, they are provided with a membrane to protect the eye, which we have not ; and that this does not destroy their sight is evident from many of theim being able to see,so far. And also, that their ears are placed more within, and covered with feathers, to guard them against the pressing wind. Pup. I do not perceive that birds have any teeth to chew their food.