Physical labor one of the largest promoters of health--Sudden increase of wealth often results most unfavorably--Too constant application to labor and household cares--A case illustrative-- In the contests of life the weaker go to the wall--They are often surrounded by most unfavorable sanitary surroundings, impure air, poor tenements--They become the psychological windfalls of society--Have been and will continue to be dependent when stricken down by disease 199 CHAPTER XIV. RELIGION. Influence of religious belief upon man--Not a cause of insanity--Religious belief natural to man--It is found in all nations--Man instinctively looks up to a Superior Power in hours of suffering and need--He needs such a belief to sustain and give hope--The laws of health and a religious life are in harmony--A religious belief tends toward health--So long as the present conditions of life exist, man will require its sustaining influence 211 CHAPTER XV. INSUFFICIENT SLEEP. Conditions of the brain which are supposed to produce sleep-- Congested state of the blood-vessels--An anæmic state-- Suffering when a person is for any cause deprived of sleep-- Persons usually sleep too little rather than too much-- Physiological reasons why children require more sleep than adults--They generally sleep too little, especially when living in cities--The importance of sleep for the brain learned from its universality in nature and especially from the functions of other portions of the body--In this state it recuperates its exhausted energies and stores them up for use when in a state of activity--Inability to sleep a precursor of insanity 223 CHAPTER XVI. CONCLUSION. The primary causes of few diseases are fully understood-- Prevention of insanity must come mainly from education received at home and in the school--Difficulties in the way of securing any efficient preventive measures--Educational processes may be improved in several ways: (1) by securing a larger degree of _individuality_; (2) more attention to industrial education; (3) more efficient home education--Changes in certain habits; (1) in reference to the use of alcoholic beverages; (2) in the use of tobacco; (3) the importance of longer periods of rest and recreation; (4) improved sanitary surroundings in those portions of cities occupied by the poor and laboring classes of society--The importance of systematic measures toward the prevention of insanity 237 CHAPTER I. PRELIMINARY.