INJURY AND RECOVERY iqi 



15.9 minutes, and causes it to agree with the standard 

 curve. All the abscissae are multiplied by the same f actor.*"* 

 The effect of this is to make the process appear to proceed 

 at 15 instead of at 17 °C. If the difference between the two 

 curves is due wholly to difference in temperature this 

 introduces no error, and if the difference is due in part 

 to other factors, the error, if any, is less than the usual 

 experimental error. 



The advantages of this procedure are that we can 

 employ for our calculations the constants already obtained 

 for the standard curve and also compare the theoretical 

 curves which start from the same points. This procedure 

 has therefore been followed throughout and the corrected 

 results (i. e., the figures multiplied by a suitable factor) 

 are employed in the following description. 



When the tissue was replaced in sea water the resist- 

 ance began to rise. At the end of 10 minutes it had risen 

 from 80.69 to 89.10%.^^ Since, however, the abscissae 

 of the death curve have been multiplied by 1.06 

 the same thing must be done for the recovery curve and 

 in place of 10 minutes we must put 10.6 minutes. 

 Proceeding in this manner we obtain the recovery curve 

 which is labeled 15.9 in Pig. 41. 



In order to calculate the course of the recovery we 

 must consider the reactions which determine the amount 

 of electrical resistance. When the tissue is placed in the 



"* This procedure may displace the points on the curve so that where 

 several curves are averaged it may be necessary to employ interpolation 

 in order to average points on the same ordinate. In many cases curves 

 were obtained by averaging the ordinates of death curves and recovery 

 curves before multiplying by the factor. 



" In earlier experiments it was found that complete recovery was pos- 

 sible after the resistance had fallen to about 80%. This was not the 

 case in the present series; the difference may be due to differences in 

 material or in technique. Cf. Osterhout (1915, B). 



