of much work undoubtedly tend to become mechanical, deadening, and soul-destroying. A strong impression seems to haunt the minds of some who are intimately in touch with working-class conditions that adolescent labour is excessive in amount, and that the resulting fatigue may be cumulative in its effects and injurious to the continuance of the race. Thus in 1904 Miss Anderson and her colleagues of the Factory Department, being invited to report on the subject of married women's work, found themselves impelled to the consideration of the previous life-conditions of the women, and stated: "It is the employment of women from _girlhood_, all through married life and through child-bearing that impresses itself on the mind. It is useless for any not familiar with the conditions of mill life to pronounce any opinion ... they have no conception of the stress and strain."[2] More recently Mr. Arthur Greenwood in a pamphlet (_The Schoolchild in Industry_, published by the Workers' Educational Association, Manchester, 1914) states that the fatigue and prolonged standing characteristic of some factory industries produce serious disease in girls and young women, "and, in the opinion of many doctors, sterility." The same impression may be found occasionally among Sick Visitors and the like, who work among these women. Whether there is a scientific basis for the belief it is impossible to say; there is not at present sufficient information. The investigation embodied in the present volume was undertaken in the hope that it would yield some information as to the vitally important subject of the biological effects of early employment, or, in other words, the reaction on the woman and her offspring of industrial employment in the adolescent years. No statistical data have, however, been obtained on this point; probably none such could be obtained within the limits of a small inquiry directed and financed by private persons. Even in regard to the effects of industrial work on the health of girls, without special regard to ulterior effects, there is at present very little scientific information.