In the previous papers of this series, average results obtained from the observations of groups of different children of varying degrees of undernourishment have been reported. Since the constitution of normal people is known to vary to a certain extent in different persons, the slight difference in metabolic processes reported in our previous papers might be attributed to individual difference rather than to the variations in the degree of undernourishment. In this communication we therefore present the results of studies of the basal metabolism, caloric balance and protein metabolism of the same children at different stages of their approach to normal weight. The children remained at the hospital for several months or until their weight became within 10 per cent of the average for their age and height. Twelve children were studied, nine of them being used for the protein study, nine for the study of basal metabolism and six