Abstract
1. The secretory cells are able to divide by mitosis.2. The method of mitosis is similar to that of the endodermal inter stitial cells from which they arise.3. This mitosis may take place after the secretory granules have appeared in the cytoplasm of these cells.4. The secretory cells are able to increase their number after being destined to play a part in the activity of the Hydra's body; in contrast with some of the ectodermal interstitial cells which, after being destined to play a part in the activity of the Hydra, are incapable of further increasing their number.
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