A Study of Groii'th 9 



had been starved for five weeks were taken. In the one the tails 

 were cut at the base, H^ (Table IX); in the other, Set H^ (Table 

 IX), the tails were left intact. After feeding both sets 153 mg. 

 (average) of beef a week, for four weeks, the percentage increment 

 in the injured set was 31.6, while that of the normal control only 

 20.3. 



Set F^ (Table XIV), in which the tails had been cut off at the 

 base, and which had been starved for five weeks, was divided 

 into two sets of five individuals each. In Set F^^ (Table X) the 

 animals were again injured by cutting off the regenerating stumps, 

 together w^ith a small piece of the old material of the tail. In 

 the other set F'^^ (Table X), the regenerating tails were left intact, 

 and this set together with Set H- (Table IX), the normal animals, 

 served as controls. The results show the following percentage 

 increments in the three cases, the animals being fed 153 mg. 

 of beef (average) for four weeks: 



Increment 

 per cent 



Set Fi^, injured animals 21.8 



Set Fi", with regenerating stumps intact ^3-4 



Set H'", normal intact animals 20 . 3 



This experiment was carried further by dividing Set F^ (Table 

 XIV) as F^ had been. The animals in Set F^"" (Table XI) were 

 injured by cutting the regenerating stumps as before. The results, 

 after feeding these sets as before for four weeks, were similar to 

 to those above, viz: 



Increment 

 per cent 



Set F'^ injured animals 28.5 



Set F^", with regenerating stumps intact 27 . 8 



Set H^, normal intact animals 20.3 



After five weeks' starvation and subsequent feeding 153 mg. 

 of beef a week for four weeks, the percentage increments m Sets 

 F^ and H^ (Table XV) were as follows: 



Increment 

 per cent 



Set F-, with regenerating stumps 27 



Set H2, normal intact animals 20 . 3 



