EXPERIMENTAL PHARMACOLOGY 



some ethyl bromide. How does this affect the heart! In- 

 ject a little adrenaline and let the animal recover. 



(It will be interesting to try ethyl chloride also. It can 

 be sprayed into one of the rubber tubes going to the tracheal 

 cannula. To do this an extra T-tube may be placed in the 

 circuit. ) 



Fig. 108. Cardiometer. (See also Fig. 143.) 



7. Dissection of Pulmonary Artery and Vein. Remove 

 the cardiometer and cut the stitches that hold the peri- 

 cardium to the chest wall. Pull the pericardium and heart 

 all over toward the right side of the animal. Observe the 

 left pulmonary veins at the root of the lung. Observe Fig. 

 106 closely. At the base of the heart observe the aorta 

 passing back posteriorly and then turning caudalward. In 

 the hollow of the arch of the aorta between it and the 

 heart a curved eminence covered with white fascia will be 

 seen coming from the base of the heart and passing down- 

 wards, outwards and backwards into the lung beneath the 

 most prominent pulmonary vein. With a blunt probe care- 

 fully dissect away some of the fascia over the curved emi- 



