All this time a great change has been going on in the whole interior of the egg; the chick has, of course greatly increased, and the red veins have become more numerous, and spread over the entire surface; the yolk is scarcely distinguishable from the other portions. Now, too, the bones of the chick have begun to form, and we clearly perceive the projection of the wings and the stump of the tail, while the pupil of the eye is quite clear and distinct. Larger and larger the creature grows, until it fills all the space, and has to be doubled up in a very curious manner, with the feet and the head brought together, and the bill close to the shell, ready to be used as the instrument of liberation. Many persons suppose that the parent bird chips the shell, but this is not so, it is done by the little creature within, which has first to make its way through a thick membrane, or skin; this it does on the twenty-first day of incubation; we are speaking now of the common fowl, the periods in different species of birds vary considerably, although the process of growth in all is the same. One wonders how, with its soft bill, the little creature can make its way through the tough skin, and hard, though brittle shell; but it must be remembered that the elastic skin is stretched to its greatest extent, and when in this state, a slight prick will make a large opening; and the shell, too, is no doubt, by the pressure from within, rendered less capable of resisting the stroke, slight though it be, of the bill of the prisoner, which does sometimes fail to make its escape, and dies in confinement, if not released by some friendly hand from without. As if to assist in the work of opening a passage to the light and air, there is found on the tip of the chick's bill a small horny scale, having at the centre a hard and sharp projecting point, which, from the position of the head, is brought into direct and constant contact with the inner surface of the shell; this scale soon loosens and comes away after the chick is hatched, there is then no further use for it. The preceding figure represents the chick as it lies closely folded up on the twenty-first day, just previous to its deliverance from bondage. We have now finished our account of this wonderful process, and may say in the words of a recent writer, "Dull indeed of soul must the man be, (or boy either,) in whom an egg does not inspire emotions of awe and admiration, wonder and worship. The circle of life is from the adult (fully-grown animal,) to the egg. This is the vital round--the beginning and the ending--the ending and the beginning. The wheel goes round continually, life kindling sparks of life; and what is called death is the worn-out forms becoming cold and decaying away." HOW TO PRESERVE EGGS FOR THE CABINET.