148 



LABORATORY GUIDE IN PHYSIOLOGY. 



Observations. 



a. Respiration in an atmosphere of nitrogen. 



(1) Note all symptoms. 



(2) How do these compare with those of death by- 

 oxygen starvation ? 



(3) Record post-mortem appearances. 



(4) Compare with previous cases. 



b. Respiration in an atmosphere of hydrogen. 



(5) Note carefully every abnormal appearance and 

 symptom. 



(6) Make a record of the post-mortem appearances. 



FIG. 25. 

 FIG. 25. Nitrogen generator. 



(7) Compare these with the appearances after death 

 by oxygen starvation; by CO 2 narcosis. 



c. Respiration in an atmosphere of one- third illuminating 

 gas (C6>+). 



(8) Record all symptoms. 



(9) Record post-mortem appearances. 



