CHEMISTRY OF HUMAN BODY. 9 



classes is the mammalia, to which man belongs. Ordinary 

 four-footed beasts, and monkeys, are also mammalia. 

 The mammalia differ from all fishes, reptiles, and birds, 

 first, in the possession of organs, the mammary glands, 

 which provide milk for the young; second, in possessing 

 hair; third, in having the chest separated from the ab- 

 domen by a diaphragm. 



16. The Intellect of Man makes him superior to any 

 other animal and supreme in the world. 



His power to form conceptions of right and wrong and his 

 knowledge of moral responsibility give him yet greater supe- 

 riority. But as a material object only, do anatomists study 

 man's body, and they therefore classify it among the 

 bodies of other animals according as it differs from or 

 resembles them in the arrangement of its parts. 



17. Chemistry of the Body. Suppose you put a green 

 stick into the fire: what happens? At first it hisses and 

 gives off steam; then it begins to burn; if you draw it 

 out when half burned you find it a black mass of charcoal; 

 if you put it back you find most of the charcoal will burn 

 away, but some ashes will be left which you cannot 

 make burn. If, instead of a green piece of wood, a man's 

 body be burned, we find the same results. From this 

 we learn (i) that the body contains water; (2) that it 

 contains solid things which will burn; (3) that it con- 

 tains solid matters, the ash, which will not burn. 



16. What makes man superior to all other animals ? What gives 

 him yet greater superiority ? From what standpoint is man studied 

 by anatomists? How classified ? 



17. What would be the action of fire on green wood? On man's 

 body? Hence what do we learn? What name is given the materials 

 which burn up? What those which will not burn? Of what is 

 every tissue composed ? In which do we find most water ? Mineral 

 matter? Animal matter? 



