644 



Experiments 



of the second tube led to a forked piece through which at the same 

 time communication was made in a with the pneumatic machine 

 and in b with a tube dipping into a reservoir full of mercury, which 

 tube formed a barometer. 



Fig. 41 — Flask arranged for the saturation of blood by oxygen at different 

 decompressions. 



With my set-up thus arranged, I lowered the pressure to the 

 desired point, closed cock R', took off the forked tube, and shook 

 the flask vigorously for a quarter of an hour. Under these con- 



