200 



EXPERIMENTAL PHARMACOLOGY 



an incision through the skin on each side in the proper 

 place. Then push the spear point of the tube right through 

 the muscular walls from side to side. Do this as the lungs 

 are deflated. Be sure the tube passes inside the chest cav- 

 ity and does not slip along under the parietal pleura just 



HH.'fi I 

 I 11 





/-I 0,000 



Fig. 191. Blood-pressure and bronchiole tracings showing the action of pantopon. 

 (Pantopon, or pantopium hydrochloricum, is the hydrochloric acid extract of the total 

 alkaloids of opium very soluble in water, sold by IIoffmann-LaRoche Chemical Works, 

 New York.) 



