In Nature of Mar. 21, p. 466, an abstract appears of a report issued by the Department of Health for Scotland on “Milk Tests in Lanarkshire Schools” by G. Leighton and P. L. McKinlay. In this experiment, nearly ten thousand school-children received a supplementary ration of three-quarters pint of milk daily for about four months. Two important tables from the report, showing the average increases in height and weight of the children, divided into 14 groups by age and sex, are reproduced.