The greater part of the evidence considered in this report was based on opinions derived from personal observations with very little scientific and no statistical groundwork. The complete report leaves us with a fairly accurate picture of the conditions under which a large proportion of the adolescent workers of the country are employed, with some general notions as to how these conditions react on their health and physique. Exact conclusions as to the particular effects of the conditions of labour cannot be obtained, as no records dealing with the health of girls in factories are in existence. The impossibility of securing scientific and reliable data was apparent at an early stage of the inquiry, but it was felt that by reviewing the conditions of adolescent labour and by noting general tendencies the way might be cleared for further investigation on a more scientific basis. It is now generally recognised that "fatigue has a larger share in the promotion and permission of disease than any other causal condition," and as adolescents need a sufficient reserve of energy to maintain growth as well as health, it is obvious that conditions of work that exert no injurious effect on adults may be unduly fatiguing for juvenile workers with their twofold need. Consequently the best criterion for judging the effects of industry on the health of adolescent girls will be based on observations as to the incidence of fatigue with different industrial occupations. The presence of fatigue among girl workers has been frequently noted in the course of the investigation, but in every case the evidence is deduced merely from the observations of those in contact with the girls or from the testimony of the girls themselves. Physiological research has conclusively proved that subjective sensations are not a measure or even an early sign of fatigue, and that real or objective fatigue is shown and is measurable only by the diminished capacity for performing the act that caused it. Considerable attention has been devoted to the subject of industrial fatigue during recent years, and various tests for the detection of latent fatigue have been employed. Measurement of the output of work gives the most direct test of fatigue provided allowance is made for all variable factors except the worker's changing capacity. In addition, the observation of certain secondary symptoms supplies a useful index to the degree of fatigue which work induces. Lack of co-ordination, one of the earliest manifestations of nervous fatigue, results in increased accidents. The accident rate in factories tends to be 25 to 55 per cent higher for boys and girls than for men and women. In 1912 there were 4914 accidents to female young persons in factories and workshops.[14] Much light might be thrown on the presence of fatigue amongst industrially employed girls by records of the accident rates in factories, corrected with reference to the