THE BODY.] 



PHYSIOLOGY 



you would grow heavier and stouter from day to day ; 

 if it were less, you would grow thinner and lighter ; if 

 it were just as much as and no more than you needed, 

 you would remain day after day of exactly the same 

 weight, the scale in which you sat rising as much 

 between meals as it sank at the meal time. 



. What we have to learn in this Primer is — How the 

 food becomes part and parcel of your body ; how it 

 gets oxidized ; how the oxidation gives you power to 

 move; how it is that you are able to move in all 

 manner of ways, when you like, how you like, and as 

 much as you like. * 



^ First of all we must learn something about the 

 build of your body, of what parts it is made, and how 

 the parts are put together. 



THE PARTS OF WHICH THE BODY IS MADE 



UP. § II. 



7. When you want to make a snow man, you take 

 one great roll of snow to make the body or trunk. This 

 you rest on two thinner rolls which serve as legs, 

 year the top of the trunk you stick in another thin 

 roll on either side — these you call the two arms : and 

 lastly, on quite the top of the trunk you place a round 

 ball for a head. Head, trunk, and limbs, Le, legs and 

 arms — these together make up a complete body. 



In your snow man these are all alike, all balls 

 of snow differing only in size and form ; but in your 

 own body, head, trunk, and limbs are quite unlike, as 

 you might easily tell on taking them to pieces. Now 

 you cannot very well take your own body to pieces, 

 but you easily can that of a dead rabbit. Suppose you 

 take one of the limbs, say a leg, to begin with. 



