20 - PHYSIOLOGY AND ANATOMY. 
The collarbone and shoulder-blade are also wnited to the 
breast-bone, and serve their purpose, the one forming the 
neck, the other the shoulder. The ribs are very important 
dones, for they enclose all those organs which give us life — 
and sustain it, as the lungs, heart, &c. So important are 
they, that we should be careful not to draw ‘our clothing so 
tight around them that they will press upon these organs, for 4 ) 
the ribs are softer than the teeth, and have also that sub- — 
stance called ligament—the same as in different parts of the 
spine—at the end, and they yield to = Layee’ once them, 
~~ which sometimes causes death. 
— 
We find a great many joints in ‘the body, ge in those 
situations where they are most needed. The arm is joined to 
the shoulder-blade in such a way that it can turn around ; at 
the elbow there i is a a hinge-joint, to move it upward aml 
en ’ eo mother at the wrist, also in all 
-seven bones in the hand and 
animal that has hands. The foot is 
dee cai constructed with its twenty-six little bones, 
connected: with little joints, so that we can move easily, If 
we look on the sole or bottom of the foot, we shall see that 
the middle of it appears as if arched or cut out. This en- 
walk ly and gracefully, to.run, skip, and 
ery motion we wish, But the bones 
and joint alone ¥ ‘Ov 
with a great many different muscles for this purpose, as well 
as to give wa oe proportion to the body. 
- 
ct 
id not enable us to move in all the vari- : 
ous directions we desire; therefore, Nature has provided us _ 
