208 



EXPERIMENTAL PHARMACOLOGY 



The lung shield (Fig. 200) should be dipped in warm water 

 and inserted in the chest in such a manner that the large 

 notch at the lower border of the shield will just pass over 

 the pedicle and vessels of the right lung. The flanged 

 portion w T hich turns outward at the right hand end of the 

 shield rests on the anterior surface of the diaphragm. 

 There is a groove in the shield between the large notch and 

 the out-turned flange. This groove is for the passage (ine- 



Fig. 199. The forefinger is placed over the inguinal region just at the lower edge 

 of the abdomen. The beating of the femoral artery should be felt just beneath. An in- 

 cision should be made just over the area. Note the little fold of skin picked up by the 

 forceps while the scissors are vised to cut away the skin and fascia. Do not use a 

 scalpel here. The arrangement of the mercury bulb for recording bladder contractions 

 is also shown. 



sially) of the inferior vena cava. This must not be closed 

 off or the dog will die. Now cut a small hole in the skin 

 of the right side about the position of the anterior border 

 of the sixth intercostal space. Pass an aneurism needle 

 through the muscular wall (through the skin incision) and 

 into the chest. Be sure tlie parietal pleura does not peel 



