The factory system, also, by its immensely increased productivity, is altering the old views of what is profitable, and a new science of social economics is evolving which would have been unthinkable under the old regime. In Miss Josephine Goldmark's recent most interesting book, _Fatigue and Efficiency_, she has gathered together the results of many experiments made by employers to ascertain the effects of shorter hours. There is practical unanimity in the results of these experiments. Obviously there must be a limit to the degree in which shortening hours of work would increase the output, but no one appears yet to have reached that limit. In the Factory Inspectors' Report for 1912 many cases are mentioned where employers have voluntarily reduced hours of work and find that they, as well as their work-people are benefited by the change. In one case of a large firm which had formerly worked from 8 A.M. to 8 P.M. it was arranged to cease at 7, a decrease of a whole hour, which necessitated engaging extra hands, but at the end of the year it was found that the annual cost of production was slightly diminished and the output considerably increased. Others expressed an opinion that 8 to 6.30 was "quite long enough," and that if these hours were exceeded the work suffered next morning. The same may be said in regard to other improvements in working conditions, such as ventilation, cleanliness, the provision of baths, refectories, medical aid, means of recreation; those who have taken such measures have found themselves rewarded by increased output. Even from the commercial standpoint we do not appear to have nearly exhausted the possibilities of betterment. There can be little doubt, judging from existing means of information, that if the whole of the industry of the country were run on shorter hours, higher wages, and greatly improved hygienic conditions, it would be very much more productive than it is. From the social point of view such betterment is greatly needed, especially in the case of the young of both sexes, whose health is most easily impaired by over-strain, and who are destined to be the workers, parents, and citizens of the next generation.