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"Further development of hen's egg; after Haeckel: A, the mulberry mass of cleavage cells, b, same as seen on top in fig 111, F, here viewed in profile in section, resting upon n, the simply-shaded part of the figure, to represent conventionally the mass of food-yelk. A, morula stage (as before); B, blastula stage, the mass of cells, b, forming the blastoderm, uplifted from the food-yelk, leaving the cleavage-cavity, s; w, the thickened rim of the germ-disc; C, the blastula in process of inversion, by which a layer of entoderm-cells, i, growing from periphery to centre, will apply itself to the layer of exoderm-cells, e, obliterating the cleavage-cavity, s; D, the disc-gastrula completed, by union of entoderm, i, with exoderm, e, leaving the primitive intestinal cavity, d, which is quite similar in appearance to the cleavage cavity, s, but morphologically quite different." Elliot Coues, 1884

Egg Germination

"Further development of hen's egg; after Haeckel: A, the mulberry mass of cleavage cells, b, same as…

" Fig 110 - Hens egg, nat. size, in section; from Owen, after A. Thompson. A, cicatricle or "tread," with its nucleus, of white germ-yelk, floating on surface of pale thin nutritive yelk, leading to central yelk-cavity, x; a, the yellow yelk-ball, deposited in the successive layers, forming a set of halones, and enveloped in the chalaziferous membrane which is spun out at opposite poles into the twisted strings, chalazae, c, c; b, b', successive investments of softer white albumen; d, membrana putaminis, the "soft shell" or egg-pod, between layers of which at the great end of the egg is the air space, f;e, the shell." Elliot Coues, 1884

Hen's Egg

" Fig 110 - Hens egg, nat. size, in section; from Owen, after A. Thompson. A, cicatricle or "tread,"…