112. MAX M. ELLIS. 



IV. Results. 

 I. Specific Amount of Regeneration. 



Set. I. A — .67, B — .74, C — .70, D — .66. 



Starting with the standard series A the specific amount of re- 

 generation increases in series B and decreases in series C and D. 

 Both B and C are greater than A, while D is less than A. These 

 values show two important facts: (1) that there is an optimum 

 degree of injury and (2) that there is a limit to the amount of 

 added injury that may be inflicted and the resultant regeneration 

 still be greater than that following the standard injury. This 

 limit of added injury is between C and D. 

 Set. II. E — .44, F — .48, G — .46. 



The specific amounts of Set II. follow precisely the same rule 

 of arrangement as those of Set. I. There is a rise and a fall in 

 the amount of regeneration. However no series of Set. II. is 

 below standard and as a result the limit of added injury does not 

 occur. Since the injury inflicted in series A and E was the same, 

 there being so few individuals in series E it was thought advisable 

 to obtain the values of Set II. in terms of Set I. Accordingly 

 a coefficient (1.542) was established by dividing the specific 

 amount of series A by that of series E. The specific amounts 

 of Set II. were then multiplied by this and the following table 

 made by placing the values of both sets in the order of amount 

 of injury. 

 A and E — .68, B — .74, F — .74, C — .70, G — .70, D — .66. 



In this table of the combined values there is the same plan of 

 increase and decrease in the amount of regeneration as has been 

 noted in both sets. It is a rise at the first followed by a steady 

 decline. The limit of added injury and the optimum are both 

 present. 



Considering these tables three things are evident : 



1. The amount of regeneration increases directly with the 

 amount of injury until an optimum has been attained. 



2. Beyond the optimum added injury still gives an amount of 

 regeneration greater than that of the standard injury up to a 

 limit. 



3. Beyond this limit regeneration is less than the standard. 



