The Action of Urginea Burhei {Baker). 
203 
Fig. 4 shows a rise of pressure of 120 mm. after injection of 0*5 c.c. of 
tincture of Urginea Burkei into the jugular vein of a cat weighing 4350 grm. 
(f) Action on Blood-vessels. 
The volume of an isolated loop of intestine was recorded with the 
plethysmograph, as shown in Fig. 5 ; the line i-v denotes intestinal volume. 
Fig. 4. 
Injection of 0'5 c.c. of tincture in this case causes a rise of blood-pressure 
of 30 mm. This is accompanied by a decrease in the intestinal volume, 
indicating constriction of the vessels. A second injection produces a similar 
result. (The constriction is not as great as the tracing would appear to 
show, as the movement of the lever was magnified thirty times, and the 
tambour was small.) The action is on the vessel-wall, as it is still seen 
after the autonomic nerve-endings are paralysed with a preliminary injection 
of ergotoxine. 
Fig. 5. 
The effect on the coronary arteries was much less pronounced, and with 
small concentrations the vessels were dilated and the outflow increased. 
E. Effect on the Kidney Secretion. 
The diuretic action was studied by measuring the flow of urine from the 
ureters of rabbits, before and after administration of the drug. Small doses 
