Little attention has been given until quite recent times to the effects of industrial work on the health and physique of adolescent girls. Child labour has been the subject of much discussion, and medical investigations have shown the detrimental influence exerted by wage-earning employment on the plastic organism of the growing child. It is recognised that with children bodily work often produces a greater degree of fatigue both mental and physical than does mental work of equal duration. The various legal restrictions limiting the hours and controlling the conditions of the labour of children, although inadequate in extent and sometimes only permissive in character, are evidence of a realisation that the well-being of the child is of more importance than its immediate commercial utility. This recognition of the necessity of guarding against overstrain during the critical early years does not, however, extend to the period of adolescence. The restrictions of the hours of work and the conditions of employment of young persons of both sexes differ but slightly from those applying to adult women. This failure to appreciate the special problems of adolescence is the more remarkable in that medical evidence has shown that young children grow and develop despite great hardships, while adolescence is more dependent upon favouring conditions in the environment, disturbances of which more easily retard development and effectively injure the still growing body. "In late adolescence contrasted with earlier life there is more variation in growth, much greater liability to retrogression, and increased susceptibility to outside influences, unfavourable surroundings, and conditions more readily causing arrest of growth and preventing perfect maturity."[8] In the evidence before the Physical Deterioration Committee in 1904, Dr. Eichholz[9] emphasised the need of close attention to the physical condition of young girls who take up industrial work between the ages of 14 and 18, for the conditions under which they work, rest, and eat doubtless account for the rapid falling off in physique which so frequently accompanies the transition from school to work. And the summary of that Committee states: "The period of adolescence is responsible for much waste of human material and for the entrance upon maturity of permanently damaged and ineffective persons of both sexes. The plasticity of the human organisation, the power it possesses of yielding rapidly towards degenerative or recuperative influences appears to terminate at 18."