68 



ELEMENTS OF PHYSIOLOGY 



since the ankle has only seven bones as compared with 

 eight in the wrist ? 



113. THOUGHT LESSON. Classification of the Bones. 



Copy and fill out 

 the following table. 

 Place after each 

 name in the first 

 column the number 

 of the bones of that 

 name. This number 

 should be repeated 

 in the column to 

 which the shape as- 

 signs the bone. For 

 instance, there are 

 two femur bones, 

 " 2 " is therefore 

 placed in the first 

 column ; they are 

 long, therefore " 2 " 

 is placed also in 

 the second column. 

 (See Fig. 49.) 



114. Joints. The 

 meeting of two 

 bones is called a 

 joint. Joints are of 

 two general kinds, 

 fixed (or immovable) 

 and movable. The 

 hip bones join the sa- 

 crum by fixed joints. 

 The most remarka- 

 ble fixed joints are those in the skull, the bones of which 

 fit into one another by means of toothed edges, forming 



