The Resonance of the Tissues. 



261 



positions III and part of II, the pressure in the sphygmometer bag covering- 

 part of position II and part of position I required to obliterate the pulse 

 remains the same. On the other hand, when the artery is, in addition^ 

 supported by varying pressures at position IV, the reading becomes 5-15 mm. 

 higher. Simultaneous support in positions IV, III, and part of II, makes the 

 reading at part of position II and part of position I higher by 5-10 mm. 

 of Hg. 



Table where Supporting Pressure is Applied successively at Elbow and 



Forearm. 



Supporting pressure 

 meter bag at. elbow, 



of sphygmo- 

 position IV. 



Supporting pressure in 

 armlet over part of III 

 and part of II. 



Sphygmometer bag at part of I 

 and part of IX 





mm. of Hg. 



mm. of Hg. 



mm. of H 







Experiment I ... 



40 



40 



75 



disappearance of pulse. 













65 



33 



33 



Experiment H ... 



40 



40 



73 





33 













63 



33 



33 



Experiment III ... 



40 



40 



65 



3) 















.50 



3) 



33 



Experiment IV ... 











55 



reappearance 



33 









40 



55 



33 



39 





40 



40 



65 



37 



7)3' " 



Experiment V... 









55 



37 



33 





o 



40 



55 



33 



33 





40 



40 



65 



33 



39 



Table where Supporting Pressure is Applied at Forearm only. 



Supporting pressure of armlet 

 in position III and part of H. 



Sphygmometer bag on part of I 

 and part of II. 



mm. of Hg. 



mm. of Hg. 







50 reappearance of pulse. 



10 



50 



20 



50 



30 



50 



40 



50 



50 



50 



60 



50 



70 



50 



80 



50 „ „ 



90 



50 



100 



50 



110 



50 



Xote. — It is important to commence from zero and work upwards and not raise the pressure to 

 110 mm. of Hg aU at once, because venous congestion, which is rapidly accommodated for when 

 rising from zero, otherwise proves a disturbing factor. 



