During adolescence the plasticity of the human organism makes it more easily affected by external factors. Chief among the external influences which may disturb normal development are the attitudes, postures, and movements which industrial work involves. If these are cramped and constrained the healthy action of the heart and lungs and their natural development may be retarded, while if excessive muscular strain, such as that resulting from heavy lifting or prolonged standing, is experienced, active injury to vital organs may be brought about, and similarly these factors and the demands which excessive fatigue due to long hours, etc., makes on the growing organism may result in stunted growth and abnormal development. Information on these lines can only be obtained by detailed anthropometric and medical examination, and would have to be carried out on a large scale if the datum is to be of any value. But the material so collected would be the most reliable index of the effect of industry on health and physique, and if comparison be made between industrially employed and unoccupied girls by examination of different groups the final results would be invaluable. Such an inquiry might be carried out by medical women and anthropometric investigators in specific industries throughout the country. The exact conditions of the work, number of hours worked, etc., would have to be observed, and a record made of the history as well as the present physical condition of each girl examined. If groups of girls aged between 14 and 20 from different industries are thus examined, comparison can be made by similar examination amongst girls attending secondary schools. In districts like north-east Lancashire, where the pupils of the secondary schools are drawn from the same class and from the same type of home as the majority of the operatives, the exact influence of industrial work will be more accurately gauged than where the home environment differs in the two groups. An inquiry based on methods such as these would be of vast national importance. What is needed is exact scientific information available for the guidance of those responsible for the organisation of adolescent labour, and, more important still, as a basis for new regulations controlling the extent and conditions of this labour. TABLE I Occupations of Girls in England and Wales, according to Census of 1911 00's omitted in Employed Columns Key: A: Employed. B: Per cent.