I900-I.] 



Observations on Blood Pressure. 



193 



Tracing VII. — 9/26. — Canula in horizontal end of femoral artery. 

 3 Feet up. 4 Horizontal. 



Feet down. 2 Horizontal. 



The effects of posture are less marked in the distal end of a divided 

 artery than in the proximal. Tracing 8 is taken from the distal end of 

 the femoral artery. In it the respiratory waves appear, and the whole 

 pressure is considerably lower than in the proximal end of the same 



Tracing VIII. — 9/22.— Camda in distal end of femoral artery. 1 Horizontal. 2 Head downwards. 

 3 Horizontal. 



artery. When the hind feet are lowered the pressure is scarcely altered 

 (before tracing begins), but when they are raised the pressure slowly 

 falls somewhat. This is another illustration of the rule above mentioned. 



15 



14 



1.3 



A-^-'v^y 



>.-^V/^ 



■''*^'^'V*rTvwvvvri 



'""•^ 



■"Vn^vvvn 



Tracing IX — 1/5. — Canula in proximal end of splenic artery, 

 zontal. 14 Feet up. ij Horizontal. 



12 Vertically teet down. 13 Hori- 



Tracings taken from the proximal end of the splenic artery show a 

 marked fall in the feet-down position, and a slight fall in the feet-up. 

 Thus the pressure falls in both vertical postures, but especially in the 

 feet-down one. Tracing 9 is taken from the proximal end of the splenic 

 artery. At 12 the feet were lowered, and after a short hesitation the 

 pressure fell markedly. At 13 the animal was replaced in the horizontal 



