12 Ada Springer 



There are, perhaps, not sufficient data upon which to determine 

 definitely whether or not the percentage increment is greater 

 when small pieces of the tail are cut off successively and when it is 

 cut only once at the base; but there are indications from the weekly 

 records and from the end results showing that the successive cuts 

 produce a greater increment than does the single cut at the base. 

 This would seem to indicate that the increased rate of growth 

 is the direct response to the cut without regard to the regenerating 

 mass; but there are other factors yet to be considered that show 

 the results can not be so simply interpreted. 



VI RATE OF DECREASE DURING STARVATION IN NORMAL ANIMALS 

 AND IN THOSE WITH THE TAIL REMOVED 



Six sets, consisting often individuals each, were taken November 

 13. In three sets the tails of the animals were cut off at the base, 

 in the other three sets they were left intact. After four weeks' 

 starvation a comparison shows the following percentage incre- 

 ments: 



I The injured animals 2 The normal controls 



SetFi(TableXIV) 6 Set H' (Table XW) 6.5 



Set F2 (Table XIV) 4.6 Set H^Tabie XIV) 0.5 



Set F3 (Table XIV) 8.4 Set H^ (Table XIV) 0.2 



The average for the three injured sets is 26.3 per cent, while for 

 the normal it is 29.06 per cent. 



VII RATE OF GROWTH AFTER STARVATION 



Minot states that any irregularity of growth in his guinea pigs 

 tends to be followed by an opposite compensating irregularity. 

 "Each individual appears to be striving to reach a particular 

 size. If growth ceases because of any factor which deprives the 

 individual of the normal conditions, as sickness, when the normal 

 conditions are again brought about there is a tendency, by accel- 

 eration of the rate of growth, to make up the loss." 



Starvation, although not equivalent to sickness, may be com- 

 pared with it, in that starvation is a factor which deprives the 



