III. 



THE BONES. 

 A. The Shapes of Bones. 



Materials. A human skeleton and human vertebrae of the dorsal, 

 lumbar, and cervical regions. Many different kinds of bones, as the 

 leg and wing bones of chickens, the shoulder-blades and skulls of 

 dogs and horses, bones of the ankle of sheep, and the vertebrae of 

 chickens. 



Study the bones of the human skeleton when possible, 

 but the corresponding bones of other animals, as the dog, 

 horse, and chicken, may be used for some of the experi- 

 ments. 



Select from the bones on the table : 



a. A long bone. 



1. What is its general shape? 



2. Compare with the human skeleton and find other 



long bones. 



b. A tabular or plate-like bone, as the shoulder-blade. 



1. What is its general shape ? 



2. Compare with the human skeleton and find other 



tabular bones. 



c. A short bone, as one of the wrist bones, having about 

 the same diameter in every direction. 



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