Fig. 9. Intestine tracings. Blood specimens from a cat in which the cord had 

 been transected between the first and second dorsal segments 4 days previously. At 13, 

 15 and 17, Ringer's solution was replaced by indifferent (venous) blood, and this at 14 

 by indifferent blood to which was added "adrenalin" to make a concentration of 

 1:130,000,000; at 16 by a suprarenal blood specimen collected before injection of 

 strychnin; at 18 by indifferent blood to which was added "adrenalin" to make a con- 

 centration of 1:195,000,000. All the blood specimens were diluted with 3 volumes 

 Ringer's solution (the "adrenalin" bloods after adding the "adrenalin"). The concen- 

 tration of epinephrin in the suprarenal blood was assayed at 1 : 150,000,000, correspond- 

 ing to an output of only 0.0000025 mgm. per kgm. per minute, one-hundredth of the 

 normal average. The segment was exceptionally sensitive. (Reduced to one-half.) 

 (After Stewart and Rogoff, Am. J. Physiol.) 



Fig. 10. Intestine tracings. Blood specimens from the same cat as Fig. 9. At 

 33, 35, 37, and 39, Ringer's solution was replaced by indifferent (arterial) blood, and 

 this at 34 by indifferent blood to which was added "adrenalin" to make a concentration 

 of 1:6,600,000; at 36 by a suprarenal blood specimen (collected 8 minutes after intra- 

 venous injection of strychnin) diluted with 3 volumes of indifferent blood; at 38, by 

 indifferent blood to which was added "adrenalin" to make a concentration of 1:2,700,000; 

 at 40, by the same suprarenal blood specimen diluted with 3 volumes of indifferent 

 blood. All the blood specimens, were diluted with 3 volumes Ringer's solution (the 

 "adrenalin" bloods after adding the "adrenalin"). The suprarenal blood (after strych- 

 nin) was assayed at 1:1,000,000 epinephrin, corresponding to an output of 0.00025 

 mgm. per kgm. per minute, which is the normal average. Strychnin accordingly 

 increased the output in this case 100 times. (Reduced to one-half.) (After Stewart 

 and Rogoff, Am. J. Physiol.) 



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