ce all higher tator, Nature. All animals from those very low in the followed and resulted from a preceding stage; develop- animal life comes from the egg, then what question scale up to the highest develop in a fashion strikingly ment was "epigenetic." Now keeping in mind the fact should be of so… … Much to the credit of present-day students of animal The frog's egg is a small sphere about as large as a Fig. 4.—Diagrams illustrating the results when the first two cells of squirrel-shot surrounded by a mass of jelly-like ma- development, such experiments have been performed the developing egg…
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