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Excerpt from The Journal of Experimental Zoölogy, Vol. 36: July-November, 1922
By investigation of the regeneration of pieces of the same length from different regions Of the body Of animals of the same size, Child Showed that there is a definite gradation in head frequency in such pieces, decreasing from the head posteriorly to the region at which fission usually occurs, indicating there the posterior limit of the first zooid. Then it rises abruptly to decrease again toward the end Of the second zooid (child, '11 a, '11 b).
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