a sphere of yolk about the size of a walnut. This sphere has grown gradually to its present condition by the multiplication of those infinitely small organic elements which physiologists call cells and which are as it were the bricks out of which the living structure is built. These cells multiply by producing new generations of cells within themselves which Nike Australia are then set free by the bursting of the outer envelope; and in this way the yolk Nike Air Max 90 is constantly increased in bulk. This process goes on all the time while the yolk is forming enlarging and transforming itself into a new being.The yolk is suspended within the second or inner membrane by two strings of white a little firmer in consistency than the Christian Louboutin Outlet rest of the albumen and it swings upon these two strings in such a manner as to retain always the Nike Air Max same position. On one side of the yolk when the egg has been laid you may see on opening the shell a little white speck: that is the beginning of the germ; naturalists call it the blastoderm. I will rapidly explain how that is formed. The whole yolk as I have said consists of myriads of minute cells each of which is in itself a complete organism. Every such cell in Coach Outlet Store Online its most perfect condition is a spherical body containing a transparent fluid Coach Outlet Store Online within which floats another smaller bag and in that another still smaller which is perhaps more compact though it may also be hollow. This transparent fluid may become slightly granular or cloudy in appearance. Apply to it a high magnifying power however say of two thousand diameters and then we shall find that this cloudy fluid resolves itself into grains each of which is a hollow bag resembling the larger cells. In fact the egg itself at first a mere granule of yolk hardly yet observed in its internal structure is in a later phase such a cell as I have described.It is now generally understood that all animal substances are but the result of the multiplication and increase of such cells which assume different forms different consistency and various combinations being peculiarly modified and adapted to every organ. Bone is nothing but an accumulation of cells of very irregular form in which limestone particles are consolidating. Flesh is nothing but elongated thread-like cells confined together in bundles. Cartilage is nothing but a combination of cells having thicker walls of a more transparent character. Every substance in short of which the body in its adult condition is composed be it brain tendon flesh blood bone skin or the fluid secreted by the various glands unless they are merely material to be thrown off from the body are but various cells in their numerous modifications having their marked peculiarities in each substance but when first forming exactly the same in all. Up to this time the cells are alike and are scattered uniformly throughout the whole mass of the yolk but by an impulse within the yolk itself neither modified by nor allied with anything elseby an internal impulse in shortthese cells at a given time begin to multiply more rapidly on one side of the yolk than on the other and ae they multiply they become also smaller; that is the new cells produced are smaller than the older cells from which they are derived. These new cells accumulate upon one side of the yolk and form a little whitish speck on its surface. This is the beginning of a new being. It Christian Louboutin Outlet is so merged in the rest of the yolk as hardly to be distinguishable from it. You cannot mark the boundary between that field of individualized cells and the adjoining yolk. Examined from above it is seen to be a hollow sphere somewhat more dense in the centre and fading towards the periphery. Evidently the smaller whitish cells composing it are more crowded towards the centre than near the periphery; they are in larger number and disposed in more numerous layers than they are on the margin. On its lower edge it Coach Outlet Store Online melts into theother cells in such a way Nike Shoes Australia that the poini where it ceases and the yolk begins couhl hardly be marked.Now that layer enlarges; and as its