162 Proceedings of Royal Society of Edinburgh. [sess. 
the active principle was isolated, that *000001 g. per kilogram of 
body weight would produce a distinct action of the heart and 
arteries. 
{a) [b) 
(<0 
Fig. 1. To show the effect on the blood pressure of intravenous injection 
in the rabbit of -00031 mg. per kilo of (a) Hemisine ; (6) Suprarenalin ; 
and (c) Adrenalin. 
The same rise of pressure was given whether the initial pressure 
was low or high.* 
In all traces time is marked in half-minutes. 
