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The Chemistry of the Body
17
several cells. Of these it is only natural to suppose that some have greater enzyme-forming powers than others. A step higher in the animal scale, or a further advance
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in the development of the schematic embryo (depicted in Diagrams 3 to 6), and we find that these special digestive cells are losing their sturdier qualities and being placed
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in a position protected by cells which have specialized in another direction. This is shown in Diagram 4, where the hollow ball of cells which resulted from the repeated
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division of one cell is represented in section. One side of the ball is pushed in, and now the beast consists of two layers of cells, an outer protecting and an inner digesting (Hydra and sea-anemone). Soon, however, it
