ACTIOX OF NITRITES 



405 



Hie animal fully recovers another set of records may be 

 taken by administering a second pearl. (Under special con- 

 ditions yon may sometimes want to administer amyl nitrite 

 to the animal by placing the drug in an empty ether bottle 

 through which the animal is allowed to breathe tem- 

 porarily.) Do yon note any effects on the spleen or loop of 



Fig. 329. Tracing showing the action of nitroglycerine on the carotid pressure and the 



respiration in a dog. 



intestine? If so how do yon account for the action? Is it 

 an active or a passive affair ? What mechanical factors are 

 involved? Explain any changes observed in the blood-pres- 

 sure and respiration. 



When the animal fully recovers take a normal record 

 and then inject two cubic centimeters of the nitroglycerine 

 solution. Do you get a satisfactory record? (If not a sec- 



