2 LETTERS TO BROTHER JOHN. . 



They will, I hope, enable you to understand what 

 diet is most proper for man, both in sickness and 

 in health ; and what are the habits of life which are 

 most likely to conduce to a sound mind and a sound 

 body. For if I were requested to teach a man 

 how to regulate his watch so as to make it keep 

 true time, I should think the best way to enable 

 him to do this, would be to make him acquainted 

 with the internal mechanism of a watch shewing 

 him the uses of the several wheels and springs 

 which keep his watch going. So, I believe, the best 

 plan to teach men how to regulate their diet and 

 habits of life, so as to make their health keep true 

 time, is to make them acquainted with the mechanism 

 of their internal selves shewing them the uses of 

 the several organs and fluids which keep LIFE going. 

 But, before we descend to particulars, it will be 

 as well to take a rapid and brief, but general, 

 survey of the several parts which form the com- 

 position of the animal, man. I say, the animal ; 

 because here we have nothing whatever to do with 

 the higher attributes of his nature* attributes 

 which have no connexion with physical structure, 

 and the phenomena of which are wholly indepen- 



* By which I mean not the mind not the reasoning fa- 

 culty ; but the soul its immortality, &c. 



