SOME SPECIAL REGULATIVE PROCESSES 323 



weather the body naturally requires less heat than in colder 

 seasons; hence less food, especially fats and sugars, are 

 consumed in summer than in winter, in the tropics than in 

 temperate or frigid regions. Suppose you have changed 

 your clothing in summer to the very coolest, and are still 

 oppressed by the heat, what changes should you make in 

 your diet ? Suitable food eaten in moderation adds 

 greatly to one's comfort in warm weather, and enables 

 one to work with energy and pleasure, but partaking 

 abundantly of heating foods renders all exertion dis- 

 agreeable. 



REGULATION OF THE STORE OF ENERGY 



588. Fatigue. You learned in the chapter on stimu- 

 lants and narcotics that a man has energy stored up suffi- 

 cient to support him for a certain number of days without 

 food. (How many days ?) Stored energy is simply a 

 store of food and oxygen in the tissues. The nervous sys- 

 tem so acts as to prevent any undue exhaustion of that 

 supply from taking place. When the brain is long active, 

 fatigue and sleepiness ensue. When the muscles are long 

 active, fatigue and aching ensue. The wise person rests 

 in each case. These warnings come before the exhaus- 

 tion has progressed to an injurious degree. They are 

 caused by the accumulation of the products of combustion 

 in the tissues. These products affect the nerves and the 

 warning is thus given. 



589. In what other way besides by work may poisons 

 accumulate so as to cause a feeling of exhaustion and lack 

 of energy ? What are the two kinds of tired feeling of 

 which you learned ? Has a person any more right to 

 injure his own body or allow diseased conditions to come 

 to it than he has to injure the body of another ? 



590. Improvidence. Just as there are many persons who 

 cannot keep financial capital ahead sufficient for one 



