BRONCHIAL ACTION OF OPIUM ALKALOIDS 



199 



spinal dog the blood-pressure will be about one inch above 

 the base line on the drum. Do not be alarmed so long as 

 it remains this high and is not falling. If any of the chloro- 

 form gets back to the heart, the dog may die quickly. If 

 the animal is about to die inject one-half or one cubic 



Fig. 190. Blood-pressure and bronchiole tracings showing the action of morphine 

 in a dog. These tracings were made by the method described in Experiment LXX, page 

 287. 



centimeter of adrenaline. When the blood-pressure is reg- 

 ular, then pass a brass tube (Fig. 186) directly through 

 the chest walls at the level of the ventral border of the 

 sixth intercostal space (see Fig. 187). To do this make 



