368 



EXPERIMENTAL PHARMACOLOGY 



Were the records from the ergamine satisfactory? If so no 

 more of the drug need be given at present, but if the records 

 were poor (dose too small or too large) a second injection 



Fig. 309. Tracing showing the action of ergamine (histamine) on the rate of oxygen 

 consumption, blrod-pressure and resuiraiion in a dog. The marked fall in blood-pressure 

 is not accompanied by a correspondingly great change in oxygen consumption. 



may be given, the dose being estimated from the previous 

 results. Let the animal recover (giving one-half cubic 

 centimeter of adrenaline if necessary). 



