218 ELEMENTARY PHYSIOLOGY. [XX. 



3. The movements of the diaphragm. 



4. Apnoea. 



6. Slight dyspnoea. 



C. The action of the respiratory muscles in 

 dyspnoea. 



7. The collapse of the lungs on puncturing the 

 thorax, and the consequent futility of the respira- 

 tory movements. 



8. The action of the phrenic nerve. 



