The remedy for the evils of idleness is obviously to find some useful work which will inspire real interest and enthusiasm. There are few things more necessary to a normal healthy life than to have purposeful work. A great dream or ambition in life often obviates personal ailments and nullifies their potency. Work, when done with zest, is a wonderful tonic. Exertion of any kind is usually pleasurable at first, and becomes drudgery only when too far protracted. [Sidenote: Need of Work] Normal work is one of the greatest blessings of life, but too many miss the joy of it, some because their work has gone to the extreme of drudgery and others because it has shrunk into nothingness and futility. Sometimes people become ill because their personality, hungry for work, is given nothing but introspection to feed upon. This is the self-imposed curse of the idle rich. [Sidenote: Prevention of Overstrain] Methods of preventing or correcting overstrain vary greatly, according to the kinds of overstrain. In general, overstrain of any kind tends to overfatigue. Overstrain is to be avoided, therefore, by paying heed to Nature's fatigue-signals as soon as they appear. A very moderate degree of fatigue is perhaps normal, but anything that approaches exhaustion should be avoided with the utmost care. [Sidenote: Working Hours] Working hours should be so arranged as to enable the worker to fully recuperate overnight, partly from sleep and partly from the recreation enjoyed in leisure between work and sleep. [Sidenote: Variety of Work] Variety of work is especially needed in modern times, when specialization tends to lead men to extremes. Changes in work which prevent a sense of monotony will greatly increase the power to work. A clerk will do more work, and do it more effectively, if he is occasionally allowed something else to do than to foot up columns. [Sidenote: Monotony and Interruption] If the monotonous strain of performing numerical additions is interrupted a few times daily, the adding faculty of the brain is given much needed rest. Many men in the higher rank of workers complain of the many interruptions which they suffer, but if they would welcome these interruptions instead of allowing themselves to be irritated by them, each interruption would serve the purpose of a vacation. It is in this way that some of the greatest workers, like Gladstone, have been enabled to accomplish so much. The strain of modern life is sometimes special rather than general. Often the strain comes on some one muscle or organ. Modern industry is so constituted that the individual strains one part of the body while other parts are in need of exercise. [Sidenote: Eye-strain]