CONTENTS. 1 1 



of the Blood on the BrainInfluence of Exercise on the 

 Brain Effects of insufficient Exercise Effects of excessive 

 Exercise at different Ages Case of Sir H. Davy Rules for 

 the proper Exercise of the Brain Best Time for Mental 

 Exertion Regularity essential Repetition Every Mental 

 Power to be exercised directly on its own Objects Illustra- 

 tions Influence of the Nervous System on the general 

 Health Examples 206 



CHAPTER IX. 



Causes of Bad Health Not always the Result of moral or im- 

 moral Conduct Nor of Accident But of the Infringement of 

 the Laws of Organization Proofs from past History Dimin- 

 ished Mortality from Increase of Knowledge, and better fulfil- 

 ment of the Conditions of Health The Expeditions of Anson 

 and Cook contrasted Gratifying Results of the Sanatory Ar- 

 rangements of Ross, Parry, and Franklin Pulmonary Dis- 

 eases in the Channel Fleet, from Ignorance of Physiology 

 Rates of Mortality in different Ages and Countries Causes 

 of late Improvements Condition of Wealthier and Poorer 

 Classes compared Good done by the Apprehension of Chol- 

 eraInfluence of Habit Neglect of Organic Laws in Re- 

 cruiting Service Examples Conclusion ... - 264 



