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1 Department of Zoology, University of Oklahoma, Norman, Oklahoma
1. Using the Latin square method, a study was made of the effect of the thyroid compounds diiodotyrosine, triiodothyronine, and thyroxine on respiration in planarians. No statistically significant effect was found with any one of the three chemicals under the conditions of the experiment.
2. The regulation of metabolic processes in invertebrates is discussed briefly. The suggestion is made that the same fundamental pattern of metabolic regulation may be found throughout the animal kingdom, despite the fact that no evidence of this is demonstrated in the present paper.
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