This is a statistical report on the weight and height changes of some 20,000 school children from 5 to 12 years of age, 10,000 of the children receiving daily a supplementary ration of three-fourths pint of milk over a period of four months, while the remaining 10,000 served as controls. Bulked grade A (tuberculin tested) milk was used entirely and in order to investigate the relative values of raw and pasteurized milk, half of the milk was pasteurized. Everything was done to make each group representative and to eliminate variables. The results show that the addition of milk to the diet of school children causes an increase in the rate of growth, both in height and in weight, above that of the controls. There is also some evidence of a beneficial effect in improving the general health and physique. Raw and pasteurized milk were equally efficacious in causing these changes.