Fatigue is of many sorts, some of which are a much graver obstacle to happiness than others. Purely physical fatigue, provided it is not excessive, tends if anything to be a cause of happiness; it leads to sound sleep and a good appetite, and gives zest to the pleasures that are possible on holidays. But when it is excessive it becomes a very grave evil. Peasant women in all but the most advanced communities are old at thirty, worn out with excessive toil. Children in the early days of industrialism were stunted in their growth and frequently killed by overwork in early years. The same thing still happens in China and Japan, where industrialism is new; to some extent also in the Southern States of America. Physical labour carried beyond a certain point is atrocious torture, and it has very frequently been carried so far as to make life all but unbearable. In the most advanced parts of the modern world, however, physical fatigue has been much minimised through the improvement of industrial conditions. The kind of fatigue that is most serious in the present day in advanced communities is nervous fatigue. This

kind, oddly enough, is most pronounced among the well-to-do, and tends to be much less among wage-earners than it is among business men and brain-workers.