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Calcification of intervertebral disks in children is a curious clinical and radiological entity. The purpose of this paper is to report two children with intervertebral disk calcification. The clinical manifestation, etiology, and pathological physiology are discussed, including differences in children as compared with adults.Nineteen cases have been reported in children. The first, in 1924, was by Báron.1 Later, in 1954, Silverman reviewed eight and reported seven other cases.13 In 1954 two more cases were reported,12,17 and in 1957, two additional cases.6,18 REPORT OF CASES Case 1.—An 8-year-old Negro boy was admitted to Duke University Hospital. He had been born at this hospital of an uncomplicated "term" pregnancy, weighing 1,855 gm. Labor was short; low forceps were used in delivery. He remained in the premature nursery for three weeks and weighed 2,240 gm. on discharge, at which time the physical examination was negative. Blood from the

GROUND substance has been studied by histochemical, physiological and pharmacological methods. This communication reports some electron microscopic observations made on experimentally induced changes in ground substance. A technique is described for the study of ground substance with the electron microscope.

Paper retracted by the publisher after the original posting date of February 3, 2009, and prior to preparation of the printed issue due to publisher error.