Charles Manning Child was a nationally recognized zoologist who became a leader in the study of morphogenesis, which is the formation and differentiation of tissues and organs. His most important contribution to the field of zoology was the gradient theory, the concept that an organism's regenerative ability takes place in physiological stages along an axis, with each physiological stage being connected to and affecting those areas surrounding it. "In this gradient Child believed he had found the mechanism of correlation by which the mass of cells that constitutes an animal is maintained as a unified whole of definite form and construction. The chief factor in correlation is... each level dominates the region behind and is dominated by that in front," Libbie H. Hyman explained in Biographical Memoirs of the National Academy of Sciences. Child received many honors in his lifetime and was highly respected in his field. While...