le individual. It is well known that destined to give a definite part or portion of the fu- mother alone. twins occasionally resemble one another to such a ture animal. Strange as it may seem, certain of these Experimenters have taken the eggs of certain ani- degree that they are indistinguishable… … top row of figures are normal, the bottom row indicates the result egg, however, be placed in an inverted Fig. 5.—Photographs of chicken embryos. The left one normal, and on when the egg is fastened in an inverted position; the position with the heavy yolk up instead right are " Siamese twins," the…
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