PLATE 2 



EXPLANATION OF FIGURES 



7 Outline drawing of apparatus used in experiment. A, Elevated pressure 

 reservoir filled with concentrated boric-acid solution at 37.5 C; B, Screw-clamp; 

 C, Mechanical valve; D, Mercury manometer; E, Inlet tube leading to bladder 

 through the silver suprapubic tube; F, The flanged end of suprapubic tube within 

 the bladder; G, Urethra; H, Drum; /, Timer. 



8 Pulse (1) and respiratory tracings (2) of a dog weighing 6 kg. The drop in 

 the pulse tracings to complete inhibition of cardiac beats is clearly seen, due to 

 acute hemorrhage; 260 cc. were withdrawn. The rise in the pressure and the 

 reestablishment of the rhythm is due to subsequent transfusion. (After McGrath.) 



366 



