Between 1923 and 1927 the late Professor Alexander Low measured a series of newborn babies, and in the subsequent years he succeeded in measuring 65 of the boys and 59 of the girls at each birthday up to and including 5 years. Twenty-one physical measurements were made on each child (always by Professor Low himself) and a record was kept of the number of erupted teeth, the time of closure of the anterior fontanelle, the age and parity of the mother, the age of the father and whether the baby was breast or bottle fed. The complete raw data of this growth study were published posthumously a few years ago (Low, 1952). There is very little information available on the relation between growth in the first five years and adult size and shape, and it occurred to us that the value of this growth study, which was the first longitudinal one made in Great Britain, would be greatly increased if we could find and remeasure some of the subjects now that they were grown up. Accordingly a search for them was instituted, and all except six were successfully traced. Not all, however, were available for measurement, and of those that were, a few could not be persuaded to make what, in many cases, was an arduous journey from their homes to Aberdeen or to London. In all we managed to measure, photograph and somatotype exactly 65 °' of the original group of both men and women. Thus our records, made between 20 and 25 years after the subjects' last attendances with Professor Low, concern 42 men and 38 women. The details of the follow-up are given in Table 1. A quite surprising number of subjects had died, all except one from natural causes. One of the men was crippled with rheumatoid arthritis, and another was a leucotomized schizophrenic. None of the women were ill, but two were more than six months pregnant, and so were excluded. Six of the 38 women measured were also pregnant, but their TABLE 1 FOLLOW-UP OF ABERDEEN GROWTH STUDY SUBJECTS AFTER 20 TO 25 YEARS