LESSON XVIII. RESPIRATION. 



1. By means of the spirometer make three estima- 

 tions of the number of c.c. you expire and inspire in 

 normal and maximal respiration. 



2. Determine the, amount of C0 2 in expired air. 



3. Observe with Haldane's apparatus the change in 

 respiration with increase of C0 2 in the respired air. 



The methods of experimenting will first be demon- 

 strated. 



DEMONSTRATIONS. 



1. Graphic record of dyspnoea, apncea, and of the 

 action of the vagus on respiration. 



2. Rhythmic contraction of the diaphragm and the 

 effect of stimulating the phrenic nerves. 



3. Collapse of the lungs on puncturing the thorax. 



4. Estimation of the gases of arterial and of venous 

 blood. 



5. Estimation of the gases in alveolar air. 



