Abstract
The first 3-4 mitotic divisions in the egg of the echiurid worm U. caupo were found to be accompanied by slight (2-3%) increases in respiration. The phenomenon was found at all temps. at which normal development takes place (9-24[degree]C), and it was found with air as well as with oxygen in the diver. The respiration was low or beginning to rise during prophase. It was maximum around metaphase-anaphase, lower during telophase when the cytoplasm divides. In the discussion the expts. are considered in relation to previously recorded observations.
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