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… … cell continues development, but forms Fig. 6.—Illustrating the effect of position on the developing frog's egg. The only one-half of the animal. Should the top row of figures are normal, the bottom row indicates the result egg, however, be placed in an inverted Fig. 5.—Photographs of chicken…
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