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Height measurements taken in a mixed longitudinal manner on 1084 German-born boys aged 7 to 21+ at the Carlschule Academy in Stuttgart during the period 1771-93 have been examined. The boys can be divided into upper (aristocrat), middle and lower (artisan, servant) classes, nearly all housed and fed in this boarding school. Preece-Baines curves have been fitted to a subsample of 155 boys whose measurements cover at least the period 12-16 years at a density of two or three per year. In addition, the whole data, totalling 11,040 observations, have been examined as if purely cross-sectional; and the height-at-entry measurement for each of 670 students has been examined. The results of the longitudinal subsample and the cross-sectional analyses agree reasonably well. Social class differences existed both in tempo of growth as signified by age at peak height velocity, and in adult height. The longitudinal analysis gives adult differences of about 2 cm between upper and middle classes and a further 2 cm between middle and lower, even amongst these boys all resident in the same, very privileged, school. Tempo differences between upper and middle class were minor, amounting to only 0.3 year, but lower-class boys had their maximum growth increment about a year later than the others. Amongst middle classes a secular trend of about 2 cm averaged over all ages was found between those born before 1770 and those born later. This mainly represents a trend in tempo rather than in adult height. The heights of these boys are compared with those of contemporary Austrian upper and lower classes, English upper and lower classes, American Army cadets, and American slaves. The increase in German middle-class heights during the 18th century indicates that this group was improving its nutritional status and well-being, at a time when the heights of the remainder of the population were constant or declining. This is evidence in favour of the view that at the beginning of economic development the distribution of income tends to become more skewed.