48 



MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. X, NO. 3. 



SERIES THIRD. 



In the experiments included in this series the spinal cord was always cut somewhere in the 

 cervical region, artificial respiration being maintained. Every effort was made to keep uniform- 

 ity of rate and activity in the respiratory movements, and in nearly all the experiments the 

 condition of the cord was tested by the effect of asphyxiation upon the circulation, so that it was 

 physiologically demonstrated that the vasomotor system was completely paralyzed. Further, 

 the completeness of the section of the cord was confirmed by post-mortem examination. The 

 section of the cord is a surgical procedure requiring so much cutting and time and involving 

 so much suffering that the animal was perforce thoroughly anaesthetized during the surgical 

 procedures, but in every experiment time was allowed after the operation for the effects of the 

 anaesthetic to disappear, so that the conjunctival reflexes were normal. 



Experiment 7.- 



Tbung, vigorous dog. Weight, If. kilos. Alcolwl used, 50 per cent. 



in ii/i/K r cervical rnjiini. 



Cord cut 



Experiments. — Cord cut in lower cervical region. Much hemorrhage. At post-mortem sum, of 

 the extrein, anterior fihers not cleanly cut. Asphyxia, no rise. Alcohol, 50 per cent. 



