418 QUESTIONS ON 



618. Describe the muscles that lift the shoulder ; that bend the elbow, 

 that draw the arm forward ; that bend the wrist. What is the tailor's 

 muscle ? What muscles bend the hip joint? What muscles straight- 

 en the leg? 



619. Describe the Trapezium muscle. Describe the muscle that 

 straightens the elbow ; that straightens the hip ; that bends the knee ; 

 that straightens the ancle. 



620. Describe the .muscles that draw the shoulder forward; that roll 

 the thigh outward. 



CHAPTER VI. 



621. What are the shapes of the muscles? 



622. How does the diaphragm act? The heart? The oesophagus ? 



623. What is done by the muscles? 



624. How are the muscles attached ? Describe some of the muscles 

 on the face ? 



625. How are the muscles placed in regard to the bones? 



626. What occurs in the muscles when they act ? How can you 

 feel their action ? 



627. When can the action of certain flat muscles be perceived ? 



628. How many sets of muscles has each hinge joint? What is the 

 office of each set ? 



629. H w can you perceive the alternate working of the muscles 

 that move the fingers ? 



630. How is the variety of motions produced in the ball and socket 

 joints, and in some others? 



CHAPTER VII. 



631. What muscles act at disadvantage ? 632. Illustrate in fore-arm 



633. Why is this loss of power made ? How is it provided for ? 



634. Give another illustration. 



635. Specify instances of rapid muscular motion. 



630. Specify instances of action by a concert of muscles. 



637. What power do performers on the piano-forte acquire? 



638. What precision does a skilful violinist acquire ? 



639. What illustration may be drawn from the act of writing? 



640. % What does this control over muscular action enable men to do . 

 Give an illustration. 



CHAPTER VIII. 



641. To what is the strength of muscles generally proportioned' 1 

 What exceptions ? 



642. How does the strength of man compare with that of a flea? 



643. To what does muscular power correspond ? 



644. For what purpose is muscular power given? 



645. How do the muscles of the active and inactive differ? 



646. 647. Give the first illustration. Second. Third. 



648. What employments develop the muscles best? Why? 



649. What employments develop some muscles disproportionately? 

 Why? How is this shown in other animals ? in birds? 



