Oxygen Consumption in Regenerating Tissue. 121 



water or those occurring perioically without swallowing, except as 

 to their point of origin. 



Restlessness of the starved decerebrate bird may be clearly 

 periodic or more or less continuous. If it tends to be continuous 

 picking up the bird and holding it in the hand for a moment and 

 then freeing it will end the restlessness, unless contractions of the 

 crop are occurring at the same time. If the crop is actively con- 

 tracting the bird will continue his fruitless wanderings. 



66 (1130) 



Oxygen consumption in regenerating tissue. 



By G. G. Scott. 



[From the United States Fisheries Biological Station, Woods Hole, 



Mass. 1 ] 



Little knowledge has been obtained as to the rate of metabolism 

 of regenerating tissue as compared with that of normal tissue. 

 Child, '15, 2 has found that susceptibility or physiological resistance 

 of organisms varies directly with the rate of metabolism. He 

 found, in practice, that a measure of the resistance to cyanide 

 poison was an efficient method for determining the rate of meta- 

 bolism. In experiments of regenerating tissue of Planaria (flat- 

 worm) he concluded that immediately after operation, the rate of 

 metabolism fell below normal, remained there for a few days, 

 then arose above normal where it remained for some time after 

 regeneration was complete, when it gradually approached normal. 

 I obtained the same result with Sagartia, a small anemone (Coelen- 

 terate). In my method the rate of metabolism was measured by 

 determining the amount of oxygen consumed by the regenerating 

 animals as compared with the normal animals. Oxygen deter- 

 minations were made by means of the Winkler method. The 

 experiment continued for twelve days. Determinations were 

 made every twelve hours. Table I shows percentage consumption 



1 Published by permission of Commissioner of Fisheries. 



2 Child, C. M., "Senescence and Rejuvenescence," University of Chicago Press. 

 1915. 



